为您找到与高中数学80个易错点易错题相关的共200个结果:
了解一些易错的题型,做好每一个练习。下面是读文网小编网络整理的初中物理浮力易错题以供大家学习。
初中物理浮力易错题
以上就是小编分享的初中物理浮力易错题全部内容,相信这些对你会有用的。
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化学是一科理论与实践并重的特殊科目,中考题目更考究学生的知识理解能力。初中化学中考时容易出现哪些易错题呢?下面由读文网小编整理的2017初中化学中考易错题的总结,祝同学们考试顺利!
易错点一:在“CO2通入紫色石蕊试液”试液变为红色的反应中,很多同学不明白其中的反应过程,误认为是CO2使紫色石蕊试液变红。
例1 下列说法正确的是( )
A.二氧化碳气体能使紫色的石蕊试液变红色
B.能使燃着的木条熄灭的气体一定是CO2气体
C.充满二氧化碳的集气瓶,盖好玻璃片后应正放在桌面上
D.干冰就是二氧化碳
错因会诊 错选A是因为只从现象,而没有考虑到石蕊变色的本质;因二氧化碳气体既不燃烧也不支持燃烧故认为使燃着的木条熄灭的气体一定是二氧化碳而错选B;错选D是因为只想到二冰就是二氧化碳。
解析 A错的原因是:二氧化碳跟水反应生成的碳酸使紫色的石蕊试液变红色;B错的原因是:认为只有二氧化碳气体能灭火;D只有固体二氧化碳才能叫干冰,液态或气态的二氧化碳都不能叫干冰,所以只能说干冰是固体二氧化碳;C中二氧化碳密度比空气的大,符合题意。
答案 C
易错点二:物质的除杂,错误的主要原因在于基础知识的综合应用上考虑不周全。
例2 将N2、CO、CO2、H2的混和气体依次通入足量的石灰水和灼热的CuO内,剩余气体是( )
A.N2 CO2 B.N2 C.CO2 D.N2 CO2 H2O
错因会诊 错选B是没有想到CO通过灼热的CuO内,又生成了CO2气体;不会乱猜答案而误选C;错选D没有想到H2还原CuO生成的水是液体,而不是气体。
解析 石灰水可与CO2反应生成难溶于水的CaCO3,它可以起到吸收CO2的作用,灼热的氧化铜可以与CO 、H2反应,但同时生成CO2和H2O,H2O是液体,N2不参与反应,所以剩余气体中应有N2和CO2。
答案 A
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按大气各组成成分的混和状况,可把大气分为均匀层和非均匀层。下面是读文网小编为您带来的中考地理易错题,欢迎翻阅。
以上就是读文网小编带来的中考地理易错题全部内容,希望你能喜欢。
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还未发现的第八周期应有50种元素。所以,元素周期还需要不断的补充与完善。那么你知道中考化学易错题有哪些吗?下面是读文网小编为您带来的中考化学易错题及答案,希望对大家有所帮助。
以上就是读文网小编今天分享的中考化学易错题及答案全部内容,相信对你会有帮助的。
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小朋友的学习是一步一个基础,要重视每一个测试。期末了,现读文网小编汇总了二年级数学易错应用题,供大家复习参考!
易错题案例:
妈妈买一盏52元的台灯。
(1)如果妈妈付的全是10元,她最少要付( )张10元。
(2)如果妈妈带的钱正好够买这盏台灯,她最多带了( )张10元。
小朋友们仔细读题,你就会发现两道题不同:第(1)题,妈妈付的全是10元,而没有零钱,所以最少要付6张10元才够。第(2)题,妈妈带的钱正好够买这盏台灯,证明妈妈带的钱就是52元,所以她最多带了5张10元。
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又快到期末了,现读文网小编汇总了二年级数学易错题整理练习题,供大家复习参考!
一、判断题:
1、0除以任何数都得0( )
二、( )里最大能填几?
6×( )﹤45 ( )×4﹤39
1、小丁丁、小胖、小亚三人从书架上拿了9本书后,书架上还有6本书,原来书架上有几本书?
2、筐里有50个桔子,最少拿出多少个就正好分给8个同学?
3、6元一支笔,40元最多买多少支笔?
4、先填最小的除数,再填被除数
( )÷( )=9……7 ( )÷( )=8……5
5、学校合唱队排练节目,一行站8人,有5行,欢欢是指挥,乐乐是伴奏员,学校合唱队共有多少人?
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审题,是解题的第一步,审题的正确与否,直接关系解题的成败。近年来,各类试题迷惑性因素越来越多,若不认真审题,一解便错。因此,正确审题才能提高解题的正确率。下面分析在正常解题过程中容易错误的几种情况:
① 多数是别字。无丝(私)分裂、减数(速)分裂、必需(须)氨基酸、异养(氧)型、需氧(养)型、测(侧)交、交叉(插)遗传、纯合(和)子、类(内)囊体等。② 音近别字:学生上课时没有听清老师所讲内容,只记住某个内容的轮廓,课下也没有看书复习,所以在作业和考试中写了别字。如:线(细)粒体、猫叫综合征(症)。③形似别字:学生的文字功底极差,虽然记住了某个概念,但受到形声字的干扰,极易写出别字,这在错别字中占主要部分。如:嘌呤(吟)、嘧啶(淀));④ 近形似别字:与上述原因相同。常见举例:蔗(遮)糖、抽搐(畜)、肽键(建)、缢(溢)裂、噬(筮)菌体、含氮(蛋)碱基、氨(胺)基、光合(和)作用、线(腺)粒体。⑤ 习惯写法:写遗传图解时,当有大、小写字母时,先写大写、后写小写字母;当有常染色体和性染色体遗传病时,先写常染色体后写性染色体遗传病基因型;常染色体遗传病直接写出基因型,性染色体遗传病先写性染色体,后在性染色体的右上角,写出相应的基因。如一个男子白化病携带者,同时患红绿色盲,其基因型为:AaXbY。为了避免做题时,出现在书写上、文字上发生错误。所以平时就必须要认真、细心。
参考答案: 1──5ADBAD 6──10 CDBAB 11──17 DDDBBAC
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为即将到来的中考,同学们要如何准备英语作文题呢?接下来是读文网小编为大家带来的关于中考英语书面表达必背80个句子,希望会对大家有所帮助。
1.According to a recent survey ,four-million people die each year from diseases linked to smoking.
依照最近的一项调查,每年有4,000,000人死于与吸烟相关的疾病。
2.The latest surveys show that Quite a few children have unpleasant associations with homework.
最近的调查显示相当多的孩子对家庭作业没什么好感。
3.No invention has received more praise and abuse than Internet.
没有一项发明象互联网同时受到如此多的赞扬和批评。
4.People seem to fail to take into account the fact that education does not end with graduation.
人们似乎忽视了教育不应该随着毕业而结束这一事实。
5.Many experts point out that physical exercise contributes directly to a person’s physical fitness.
许多专家指出体育锻炼直接有助于身体健康。
6.Nowadays ,many students always go into raptures at the mere mention of the coming life of high school or college they will begin. Unfortunately ,for most young people ,it is not pleasant experience on their first day on campus.
当前,一提到即将开始的学校生活,许多学生都会兴高采烈。然而,对多数年轻人来说,校园刚开始的日子并不是什么愉快的经历。
7.In view of the seriousness of this problem ,effective measures should be taken before things get worse.
考虑到问题的严重性,在事态进一步恶化之前,必须采取有效的措施。
8.Proper measures must be taken to limit the number of foreign tourists and the great efforts should be made to protect local environment and history from the harmful effects of international tourism.
应该采取适当的措施限制外国旅游者的数量,努力保护当地环境和历史不受国际旅游业的不利影响。
9.An increasing number of experts believe that migrants will exert positive effects on construction of city .However ,this opinion is now being questioned by more and more city residents ,who complain that the migrants have brought many serious problems like crime and prostitution.
越来越多的专家相信移民对城市的建设起到积极作用。然而,越来越多的城市居民却怀疑这种说法,他们抱怨民工给城市带来了许多严重的问题,象犯罪和卖淫。
10.Many city residents complain that it is so few buses in their city that they have to spend much more time waiting for a bus ,which is usually crowded with a large number of passengers.
许多市民抱怨城市的公交车太少,以至于他们要花很长时间等一辆公交车,而车上可能已满载乘客。
11.There is no denying the fact that air pollution is an extremely serious problem :the city authorities should take strong measures to deal with it.
无可否认,空气污染是一个极其严重的问题:城市当局应该采取有力措施来解决它。
12.An investigation shows that female workers tend to have a favorable attitude toward retirement.
一项调查显示妇女欢迎退休。
13.A proper part-time job does not occupy student's too much time .In fact ,it is unhealthy for them to spend all of time on their study .As an old saying goes :All work and no play makes Jack a dull boy
一份适当的业余工作并不会占用学生太多的时间,事实上,把全部的时间都用到学习上并不健康,正如那句老话:只工作,不玩耍,聪明的孩子会变傻。
14.Any government which is blind to this point may pay a heavy price.
任何政府忽视这一点都将付出巨大的代价。
15.An increasing number of people are beginning to realize that education is not complete with graduation.
越来越多的人开始意识到教育不能随着毕业而结束。
16.When it comes to education ,the majority of people believe that education is a lifetime study.
说到教育,大部分人认为其是一个终生的学习。
17.The majority of students believe that part-time job will provide them with more opportunities to develop their interpersonal skills ,which may put them in a favorable position in the future job markets.
大部分学生相信业余工作会使他们有更多机会发展人际交往能力,而这对他们未来找工作是非常有好处的。
18.It is indisputable that there are millions of people who still have a miserable life and have to fact the dangers of starvation and exposure.
无可争辩,现在有成千上万的人仍过着挨饿受冬的痛苦生活。
19.Although this view is widely held ,this is little evidence that education can be obtained at any age and at any place.
尽管这一观点被广泛接受,很少有证据表明教育能够在任何地点任何年龄进行。
20.No one can deny the fact that a person’s education is the most important aspect of his life.
没有人能否人这一事实:教育是人生最重要的一方面。
21.People equate success in life with the ability of operating computer .
人们把会使用计算机与人生成功相提并论。
22. In the last decades, advances in medical technology have made it possible for people to live longer than in the past.
在过去的几十年,先进的医疗技术已经使得人们比过去活的时间更长成为可能。
23. In fact, we have to admit the fact that the quality of life is as important as life itself.
事实上,我们必须承认生命的质量和生命本身一样重要。
24. We should spare no effort to beautify our environment.
我们应该不遗余力地美化我们的环境。
25. People believe that computer skills will enhance their job opportunities or promotion opportunities.
人们相信拥有计算机技术可以获得更多工作或提升的机会。
26. The information I've collected over last few years leads me to believe that this knowledge may be less useful than most people think.
从这几年我搜集的信息来看,这些知识并没有人们想象的那么有用。
27. Now, it is generally accepted that no college or university can educate its students by the time they graduation.
现在,人们普遍认为没有一所大学能够在毕业时候教给学生所有的知识。
28. This is a matter of life and death--a matter no country can afford to ignore.
这是一个关系到生死的问题,任何国家都不能忽视。
29. For my part, I agree with the latter opinion for the following reasons:
我同意后者,有如下理由:
30. Before giving my opinion, I think it is important to look at the arguments on both sides.
在给出我的观点之前,我想看看双方的观点是重要的。
31. This view is now being questioned by more and more people.
这一观点正受到越来越多人的质疑。
32. Although many people claim that, along with the rapidly economic development, the number of people who use bicycle are decreasing and bicycle is bound to die out. The information I've collected over the recent years leads me to believe that bicycle will continue to play extremely important roles in modern society.
尽管许多人认为随着经济的高速发展,用自行车的人数会减少,自行车可能会消亡, 然而,这几年我收集的一些信息让我相信自行车仍然会继续在现代社会发挥极其重要的作用。
33. Environmental experts point out that increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet.
环境学家指出:持续增加的污染不仅会导致像全球变暖这样严重的问题,而且还将威胁到人类在这个星球的生存。
34. In view of such serious situation, environmental tools of transportation like bicycle are more important than any time before.
考虑到这些严重的状况,我们比以往任何时候更需要像自行车这样的环保型交通工具。
35. Using bicycle contributes greatly to people's physical fitness as well as easing traffic jams.
使用自行车有助于人们的身体健康,并极大地缓解了交通阻塞。
36. Despite many obvious advantages of bicycle, it is not without its problem.
尽管自行车有许多明显的优点,但是它也存在它的问题。
37. Bicycle can't be compared with other means of transportation like car and train for speed and comfort.
在速度和舒适度方面,自行车是无法和汽车、火车这样的交通工具相比的。
38. From what has been discussed above, we may safely draw the conclusion that advantages of bicycle far outweigh its disadvantages and it will still play essential roles in modern society.
通过以上讨论,我们可以得出结论:自行车的优点远大于缺点,并且在现代社会它仍将发挥重要作用。
39. There is a general discussion these days over education in many colleges and institutes. One of the questions under debate is whether education is a lifetime study.
当前在高校和研究机构对教育存在着大量争论,其中一个问题就是教育是否是个终身学习的过程。
40. This issue has caused wide public concern.
这个问题已经引起了广泛关注。
41. It must be noted that learning must be done by a person himself.
必须指出学习只能*自己。
42. A large number of people tend to live under the illusion that they had completed their education when they finished their schooling. Obviously, they seem to fail to take into account the basic fact that a person's education is a most important aspect of his life.
许多人存在这样的误解,认为离开学校就意味着结束了他们的教育。显然,他们忽视了教育是人生重要部分这一基本事实。
43. As for me, I'm in favor of the opinion that education is not complete with graduation, for the following reasons:
就我而言,我同意教育不应该随着毕业而结束的观点,有以下原因:
44. It is commonly accepted that no college or university can educate its students by the time they graduate.
人们普遍认为高校是不可能在毕业的时候教会他们的学生所有知识的。
45. Even the best possible graduate needs to continue learning before she or he becomes an educated person.
即使最优秀的毕业生,要想成为一个博学的人也要不断地学习。
46. It is commonly thought that our society had dramatically changed by modern science and technology, and human had made extraordinary progress in knowledge and technology over the recent decades.
人们普遍认为我们的现代科技使我们的社会发生了巨大的变化,近几十年人类在科技方面取得了惊人的进步。
47. Now people in growing numbers are beginning to believe that learning new skills and knowledge contributes directly to enhancing their job opportunities or promotion opportunities.
现在越来越多的人开始相信学习新的技术和知识能直接帮助他们获得工作就会或提升的机会。
48. An investigation shows that many older people express a strong desire to continue studying in university or college.
一项调查显示许多老人都有到大学继续学习的愿望。
49. For the majority of people, reading or learning a new skill has become the focus of their lives and the source of their happiness and contentment after their retirement.
对大多数人来讲,退休以后,阅读或学习一项新技术已成为他们生活的中心和快乐的来源。
50. For people who want to adopt a healthy and meaningful life style, it is important to find time to learn certain new knowledge. Just as an old saying goes: it is never too late to learn.
对于那些想过上健康而有意义的生活的人们来说,找时间学习一些新知识是很重要的,正如那句老话:活到老,学到老。
51. There is a general debate on the campus today over the phenomenon of college or high school students' doing a part-time job.
对于大学或高中生打工这一现象,校园里进行着广泛的争论。
52. By taking a major-related part-job, students can not only improve their academic studies, but gain much experience, experience they will never be able to get from the textbooks.
通过做一份和专业相关的工作,学生不仅能够提高他们的专业能力,而且能获得从课本上得不到的经验。
53. Although people’s lives have been dramatically changed over the last decades, it must be admitted that, shortage of funds is still the one of the biggest questions that students nowadays have to face because that tuition fees and prices of books are soaring by the day.
近几十年,尽管人们的生活有了惊人的改变,但必须承认,由于学费和书费日益飞涨,资金短缺仍然是学生们面临的最大问题之一。
54. Consequently, the extra money obtained from part-time job will strongly support students to continue to their study life.
因此,业余工作挣来的钱将强有力地支持学生们继续他们的求学生活。
55. From what has been discussed above, we may safely draw a conclusion that part-time job can produce a far-reaching impact on students and they should be encouraged to take part-time job, which will benefit students and their family, even the society as a whole.
通过上面的讨论,我们不难得出结论:业余工作对学生们会产生深远的影响,我们应鼓励学生从事业余工作,这将有利于学生和他们的家庭,甚至整个社会。
56. These days, people in growing numbers are beginning to complain that work is more stressful and less leisurely than in past. Many experts point out that, along with the development of modern society, it is an inevitable result and there is no way to avoid it.
现在,越来越多的人们开始抱怨工作比以前更有压力。许多专家指出这是现代社会发展必然的结果,无法避免。
57. It is widely acknowledged that computer and other machines have become an indispensable part of our society, which make our life and work more comfortable and less laborious.
人们普遍认为计算机和其他机器已经成为我们社会必不可少的一部分。 它们使我们的生活更舒适,减少了大量劳动。
58. At the same time, along with the benefits of such machines, employees must study knowledge involved in such machines so that they are able to control them.
同时,随着这些机器带给我们的好处,员工们也必须要学习与之相关的知识以便使用它们。
59. No one can deny the basic fact that it is impossible for average workers to master those high-technology skills easily.
没有人能否认这一基本事实:对于一般工人来讲,轻松掌握这些技术是不可能的。
60. In the second place, there seem to be too many people without job and not enough job position.
第二方面,失业的人似乎太多而又没有足够的工作岗位。#p#副标题#e#
61. Millions of people have to spend more time and energy on studying new skills and technology so that they can keep a favorable position in job market.
成千上万的人们不得不花费更多的精力和时间学习新的技术和知识,使得他们在就业市场能保持优势。
62. According to a recent survey, a growing number of people express a strong desire to take another job or spend more time on their job in order to get more money to support their family.
根据最近的一项调查,越来越多的人表达了想从事另外的工作或加班以赚取更多的钱来补贴家用的强烈愿望。
63. From what has been discussed above, I am fully convinced that the leisure life-style is undergoing a decline with the progress of modern society, it is not necessary a bad thing.
通过以上讨论,我完全相信,随着现代社会的进步,幽闲的生活方式正在消失并不是件坏事。
64. The problem of international tourism has caused wide public concern over the recent years.
近些年,国际旅游的问题引起了广泛关注。
65. Many people believe that international tourism produce positive effects on economic growth and local government should be encouraged to promote international tourism.
许多人认为国际旅游对经济发展有积极作用,应鼓励地方政府发展国际旅游。
66. But what these people fail to see is that international tourism may bring about a disastrous impact on our environment and local history.
但是这些人忽视了国际旅游可能会给当地环境和历史造成的灾难性的影响。
67. As for me, I'm firmly convinced that the number of foreign tourists should be limited, for the following reasons:
就我而言,我坚定地认为国外旅游者的数量应得到限制,理由如下:
68. In addition, in order to attract tourists, a lot of artificial facilities have been built, which have certain unfavorable effects on the environment.
另外,为了吸引旅游者,大量人工设施被修建,这对环境是不利的。
69. For lack of distinct culture, some places will not attract tourists any more. Consequently, the fast rise in number of foreign tourists may eventually lead to the decline of local tourism.
由于缺乏独特的文化,一些地方不再吸引旅游者。因此,国外旅游者数量的快速增加可能最终会导致当地旅游业的衰败。
70. There is a growing tendency for parents to ask their children to accept extra educational programs over the recent years.
近些年,父母要求他们的孩子接受额外的教育呈增长的势头。
71. This phenomenon has caused wide public concern in many places of world.
这一现象在全世界许多地方已引起了广泛关注。
72. Many parents believe that additional educational activities enjoy obvious advantage. By extra studies, they maintain, their children are able to obtain many kinds of practical skills and useful knowledge, which will put them in a beneficial position in the future job markets when they grow up.
许多家长相信额外的教育活动有许多优点,通过学习,他们的孩子可以获得很多实践技能和有用的知识,当他们长大后,这些对他们就业是大有好处的。
73. In the first place, extra studies bring about unhealthy impacts on physical growth of children. Educational experts point out that, it is equally important to take some sport activities instead of extra studies when children have spent the whole day in a boring classroom.
首先,额外的学习对孩子们的身体发育是不利的。教育专家指出,孩子们在枯燥的教室里呆了一整天后,从事一些体育活动,而不是额外的学习,是非常重要的。
74. Children are undergoing fast physical development; lack of physical exercise may produce disastrous influence on their later life.
孩子们正处于身体快速发育时期,缺乏体育锻炼可能会对他们未来的生活造成严重的影响。
75. In the second place, from psychological aspect, the majority of children seem to tend to have an unfavorable attitude toward additional educational activities.
第二,从心理上讲,大部分孩子似乎对额外的学习没有什么好感。
76. It is hard to imagine a student focusing their energy on textbook while other children are playing.
当别的孩子在玩耍的时候,很难想象一个学生能集中精力在课本上。
77. Moreover, children will have less time to play and communicate with their peers due to extra studies, consequently, it is difficult to develop and cultivate their character and interpersonal skills. They may become more solitary and even suffer from certain mental illness.
而且,由于要额外地学习,孩子们没有多少时间和同龄的孩子玩耍和交流,很难培养他们的个性和交际能力。他们可能变得孤僻甚至产生某些心理疾病。
78. From what has been discussed above, we may safely draw the conclusion that, although extra studies indeed enjoy many obvious advantages, its disadvantages shouldn't be ignored and far outweigh its advantages. It is absurd to force children to take extra studies after school.
通过以上讨论,我们可以得出结论:尽管额外学习的确有很多优点,但它的缺点不可忽视,且远大于它的优点。因此,放学后强迫孩子额外学习是不明智的。
79. Any parents should place considerable emphasis on their children to keep the balance between play and study. As an old saying goes: All work and no play makes Jack a dull boy.
任何家长都应非常重视保持孩子在学习与玩耍的平衡,正如那句老话:只工作,不玩耍,聪明的孩子会变傻。
80. There is a growing tendency for parent these days to stay at home to look after their children instead of returning to work earlier.
现在,父亲或母亲留在家里照顾他们的孩子而不愿过早返回工作岗位正成为增加的趋势。
看过中考英语书面表达必背80个句子的还看了:
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ecause he was ill yesterday, so he didn’t go to work. (×)
Because he was ill yesterday, he didn’t go to work. (√)
He was ill yesterday, so he didn’t go to work. (√)
[析] 用though, but表示“虽然……,但是…… ”或用because, so 表示“因为……,所以……”时,though和but 及because和so 都只能择一而用,不能两者同时使用。
2.The Smiths have moved Beijing. (×)
The Smiths have moved to Beijing. (√)
[析] 不及物动词后接名词或代词作宾语时,要在动词之后加上适当的介词;但不及物动词后接home, here, there等副词作宾语时,动词之后不必加任何介词。
3.The box is too heavy for him to carry it. (×)
The box is too heavy for him to carry. (√)
[析] the box既是这句话的主语, 也是不定式to carry的逻辑宾语,若句末再加上it,就和the box重复了。
4.Each of the boys have a pen. (×)
Each of the boys has a pen. (√)
[析] 复数名词前有表个体的each of, one of, every,either of等词组修饰,或有表否定的neither of, none of 等词组修饰时,谓语动词要用单数形式。
5.例:那是你心软!我不就是一个例子吗?
Neither he nor you is good at English. (×)
Neither he nor you are good at English. (√)
[析] either... or..., neither... nor..., not only..., but also... 等词组连接句子的两个主语时,谓语动词遵循“就近一致原则”, 即由靠近谓语的那个主语决定谓语的人称和数用何种形式。
6.Ten minus three are seven. (×)
Ten minus three is seven. (√)
[析] 用英语表示加(plus)、减(minus)等数学运算时,谓语动词也用单数形式。
7.The number of the workers in this factory are about 5,000. (×)
The number of the workers in this factory is about 5,000. (√)
[析] the number of表示“……的数量”,谓语动词用单数形式;a number of 的意思是“若干”或“许多”,相当于some或a lot of,和复数名词连用,谓语动词用复数形式。
8. 例. Hello! I have important something to tell you. (×)
Hello! I have something important to tell you. (√)
[析] 形容词或动词不定式修饰不定代词作定语时,修饰成分要置于不定代词之后。
9. His son is enough old to go to school. (×)
His son is old enough to go to school. (√)
[析] enough作形容词修饰名词时,可以放在名词前,也可放在名词后;作副词修饰形容词或副词时,只能放在形容词或副词之后。
10.. Here is your sweater, put away it.(×)
Here is your sweater, put it away. (√)
[析] put away, pick up, put on等“动词+副词”构成的词组后接代词作宾语时,代词只能放在动词和副词之间。
11. Look! Here the bus comes.(×)
Look! Here comes the bus.(√)
[析] 在以here, there引起的陈述句中,若句子的主语是名词,要用倒装语序,即用“Here /There+动词+名词”结构;但主语若是代词时,则不用倒装语序, 即用“Here/There +代词+动词”结构。
12. I do well in playing football, _______. (我妹妹也行。)A. so my sister does(×)B. so does my sister(√)
Li Lei is really a football fan. --- _______. (确实这样.) A. So is he(×) B. So he is(√)
[析] “so+be动词/助动词+主语”的倒装结构表示前面所述情况也适用于后者,意为“……也是这样”;“so+主语+be动词/助动词”的陈述结构表示对前述情况的肯定,意为“……确实如此”。
13.重庆比中国的其他城市都大。
Chongqing is larger than any city in China. (×)Chongqing is larger than any other city in China. (√)
[析] “any city in China”包括了重庆这座城市, 同一事物自己与自己不能做比较,只有在city 前加上other才能表示重庆和中国的其它城市比较大小。
The weather in Guangzhou is warmer than Beijing. (×)
The weather in Guangzhou is warmer than that in Beijing . (√)
[析] 表示比较时,句子中的两个比较对象必须一致,不同的比较对象不能做比较。错误句的比较对象分别为the weather in Guangzhou和Beijing,这两个不同类的事物之间不能做比较。
14, His sister married with a teacher last summer.(×)His sister married a teacher last summer. (√)
[析] 表达“A和B结婚”,要用A married/will marry B。这时务必要避免受汉语影响使用A married/will marry with B。
15. 例There is going to have a film tonight. (×) There is going to be a film tonight. (√)
[析] 一般将来时用在 There be 句式中时,be going to或will之后的动词原形只能用be,也就是说要用There is (are) going to be.... / There will be....。
16. 例I’ll go hiking if it won’t rain next Sunday. (×)I’ll go hiking if it doesn’t rain next Sunday.(√)
[析] 习惯上在含有时间状语从句和条件状语从句的复合句中,如果主句的谓语动词用了一般将来时,从句的谓语动词要用一般现在时表示将来的动作。
17.例 Teacher told us yesterday that the earth went around the sun. (×)
Teacher told us yesterday that the earth goes around the sun. (√)
[析] 习惯上在含有宾语从句的复合句中,主句的谓语动词用了一般过去时,从句的谓语动词要用过去的某种时态。但如果从句表述的是一客观事实或客观真理时,则不受主句时态的影响,而用一般现在时。
18. All the balls are not round. 翻译成汉语:
所有的球都不是圆的。(×)并不是所有的球都是圆的。(√)
[析] all, every, both等词和not连用时,not通常放在all, every, both的后面,一般情况下表示部分否定,意为“并非……都……”。
19. 例--- He didn’t go to school yesterday, did he?-- _______, though he didn’t feel very well.
A. No, he didn’t (×) B. Yes, he did (√)
例--- Don’t you usually come to school by bike?-- _______. But I sometimes walk.
A. No, I don’t (×) B. Yes, I do (√)
[析] 习惯上英语中的yes意为“是的”,no意为“不”,但在“前否后肯”的反意疑问句或否定疑问句中,yes意为“不”,no意为“是的”。
20.---- Excuse me, is the supermarket far from here?---- No,it's about _______.
A. 7 minutes walk B. 7 minute walk C. 7 minutes' walk D. 7 minute's walk
答案为C。本题考查名词所有格用法。当名词的复数以-s结尾时,则只需要加“'”即可,则“7分钟的距离”为“7 minutes' walk”。
21. You can not imagine how much I ______ on this dress. Is it beautiful?
A. paid B. took C. cost D. spent
[剖析] 答案为D。本题考察四个表“花费”的动词辨析。主语为人,且和介词on搭配的动词是spend。
22. ---- Do you know _____ university student who is talking with Joe?---- Yes, she,s my cousin, Kate.
A. a B. an C. the D. /
[剖析] 答案为C。university虽然以元音字母u开头,但其前若使用不定冠词时,则要用a.不过此题中不能使用不定冠词,而是特指和Joe说话的那个大学生,故要选the。
23. The number of giant pandas is getting ______ because their living areas are becoming farmlands.
A. less and less B. larger and larger C. smaller and smaller D. fewer and
fewer
[剖析] 答案为C。句意为“大熊猫的数量越来越少因为他们的生存空间正逐渐变成农场”。本题中四个选项都是“比较级+ and + 比较级”的结构,表示“越来越……”。主语为number,只能和large或small搭配。而结合句意可判断答案为C。
24. Be careful when you come _______ the street,because the traffic is very busy
at the moment.A. across B. behind C. between D. over
[剖析] 答案为A。本题考察方位介词的用法。“过马路”一般为表面横穿,因此要用across。
25. ---- Do you often clean your classroom?---- Yes, our classroom ______ every day.
A. clean B. cleans C. is cleaned D. Cleaned
[剖析] 答案为C。句中有every day,主语为our classroom,故要用一般现在时的被动语态。
26. Lucy usually cleans the cage every two days. (对画线部分提问)_ _______ Lucy usually clean the cage?
[剖析] 答案为How often does。对every two days提问要用how often。
27. I didn't understand __________,so I raised my hand to ask...
A. what my teacher says B. what does my teacher sayC. what my teacher said D. what did my teacher say
[剖析] 答案为C。本题为宾语从句,由于需要用陈述语序可排除B、D;另外,主句时态为一般过去时,则从句也要用对应的过去时态,故还可排除A。
28. ---- How much ______ the shoes?---- Five dollars ______ enough.
A. is;is B. are;is C. are;are D. is;are
[剖析] 答案为B。shoes作主语时,谓语动词应用复数形式;five dollars是一个整体,应按单数对待。
29. 误〕 We got to the top of the mountain in daybreak. 〔正〕 We got to the top of the mountain at day break.
〔析〕 at用于具体时刻之前,如:sunrise, midday, noon, sunset, midnight, night。
30. 〔误〕 Dont sleep at daytime 〔正〕 Dont sleep in daytime.
〔析〕 in 要用于较长的一段时间之内,如:in the morning / afternoon, 或 in the week / month / year. 或 in spring / supper /autumn / winter等等。
31. 〔误〕 He became a writter at his twenties 〔正〕 He became a writter in his twenties
〔析〕这句话应译为:他在20多岁时就成了作家。在某人的一段生活时间段中要用介词in来表示,而在具体岁数时用at来表示。
32. 误〕 We went to swim in the river in a very hot day. 〔正〕 We went to swim in the river on a very hot day.
〔析〕 具体某一天要用介词on, 又如:on New Years Day
33. 〔误〕 Im looking forward to seeing you on Christmas. 〔正〕 Im looking for ward to seeing you at Christmas.
〔析〕在节日的当天用on,而全部节日期间用at,Christmas是圣诞节期间,一般要有两周或更长的时间。
34. 误 I havent see you during the summer holidays. 正 I havent seen you since the beginning of the summer holidays.
〔析〕 during表示在某一段时间之内,所以一般不与完成时搭配,如:I visited a lot of museums during the holiday. 而for表示一段时间,可以用于完成时,如:I havent see you for a long time. 而through 用来表示时间时则为"整整,全部的时间"。如:It rained through the night.而since则是表达主句动作的起始时间,一般要与完成时连用。
35. 〔误〕 At entering the classroom, I heard the good news. 〔正〕 On entering the classroom, I heard the good news.
〔析〕 On 加动名词表示"一……就"。本句的译文应是:我一进入教室就听见这个好消息了。又如:on hearing… 一听见, on arrival 一到达就……(on表示动作的名词)
36. 〔误〕 In the beginning of the book, there are some interesting stories. 〔正〕 At the beginning of the book, there are some interesting stories.
〔析〕 at the begining与at the end都是指某事物的开始与结束部分,均不指时间范围,而in the beginning 则是指开始一段时间。in the end=at last是指"最终,终于"之意。
37. 〔误〕 Till the end of next week. I will have finished this work. 〔正〕 By the end of next week. I will have finished this work.
〔析〕 by 引起的时间状语表示了动作的截止点,其意思为"不迟于某一时刻将工作做完",所以主句一般是完成时态。当然可以有将来时态,如:Ill be there by five oclock.而till则表达其一动作一直持续到某一时刻,但句中的动词一定要用持续性动词,而瞬间的截止性动词应用其否定句式,如:I wont finish this work till(until) next weekend.
38. 〔误〕 He came to London before last weekend. 〔正〕 He had come to London before last weekend. 〔正〕 He came to London two weeks ago.
〔析〕 before 一般要与完成时连用,而ago则与一般过去时连用。
39. 〔误〕I have studied English for three years gince I had come here.正 I have studied English for three years since I came here.
析 since用来表达主句动作的开始时间,所以其引出的从句中应为过去时,而不能用完成时态
40. 〔误〕 I can help you repair this bike. You will get it after two hours. 〔正〕 I can help you repair this bike. You will get it in two hours.
〔析〕中文经常讲两小时之后来取,两天内会修好,而这个介词在英文中要用in而不要用after。其原因有二,①after 多用于过去时,如:I arrived in New York. After three days, I found a job in the bank. ② after 加时间是表达一个不确定的时间范围,如:after three days, 即三天之后的哪一天都可以。所以在许诺若干时间内会完成某事时,一定要用介词in。
41.误〕 Three days after he died. 正〕 After three days he died. 〔正〕 Three days later he died.
〔析〕 after 与 later都可以用来表达一段时间之后,但它们所处的位置不同,after 在时间词前,而later在时间词后。
42.〔误〕 She hid herself after the tree. 〔正〕 She hid herself behind the tree.
〔析〕 after多用来表达某动作之后,所以有的语法书中称它为动态介词,如:I run after him. After finishing my homework, I went to see a film. 而behind则多用于静态事物之后。
43.〔误〕 There is a beautiful bird on the tree. 正〕 There is a beautiful bird in the tree.
〔析〕 树上长出的果实,树叶要用on, 而其他外来的人、物体均要用in the tree.
44.〔误〕 Shanghai is on the east of China. 〔正〕 Shanghai is in the east of China.
〔析〕 在表达地理位置时有3个介词:in, on, to。 in表示在某范围之内; on表示与某地区接壤;to则表示不相接。如:Japan is to the east of China.
45.〔误〕 I arrived at New York on July 2nd. 〔正〕 I arrived in New York on July 2nd.
〔析〕 at用来表达较小的地方,而in用来表达较大的地方。at常用于at the school gate, at home, at a bus stop, at the station, at the cinema, at a small village。
46.〔误〕 He lived in No. 3 Beijing Road. 〔正〕 He lived at No. 3 Beijing Road.
〔析〕 在门牌号码前要用at, 并要注意它的惯用法:at the end of the street, at the foot of the mountain, at the top of the page。
47.〔误〕 There is a colour TV set at the corner of the hall. 〔正〕 There is a colour TV set in the corner of the hall.
〔析〕 在屋内的角落应用in,而墙的外角用at,如:There is a tree at the corner of the street.
48. 〔误〕 Do you know there is some good news on todays newspaper? 〔正〕 Do you know there is some good news in todays newspaper?
〔析〕 在报纸上的新闻要用in, 而在具体某一版上,或某一页上则要用on。
49. 〔误〕 The school will begin on September 1st. 〔正〕 School will begin on September 1st.
〔析〕这里的school应看作不可数名词泛指学校的课程,即开学之意。要注意,有些活动场所当表达正在从事该种活动时不要加冠词,如:at table (吃饭), When I came to Toms home, they were at table. 还有: at desk (学习),at work (工作) at school (上学), in hospital (住医院) at church 作礼拜如加上定冠词则另有他意,如:at the school 即在学校工作或办事,in the hospital 即在医院工作或去看望病人。
50. 〔误〕 Ill leave Beijing to Shanghai tomorrow. 〔正〕 Ill leave Beijing for Shanghai. 〔正〕 Ill leave for Shanghai.
〔析〕 leave for 是离开某地去某处的固定搭配,不可将for改为别的介词。这样的搭配还有:start for 动身前往某处,set out for, sail for。
51. 〔误〕 Im sorry. I have to get out the bus at next stop. 〔正〕 Im sorry. I have to get out of the bus at next stop.
〔析〕 get in, 与 get out是两个相反的词组。get in 为上车,而get out为下车,但语法家认为这里的in与out为副词,所以其后不能接名词,我们可以讲Wed better get in. 或Wed better get out. 还有一组词组有关上下车:get on/off(a train, a ship, a struck) get into/out of (a car, taxi…)
52. 〔误〕 Be careful The temperature of the water is ninety degrees over zero. 〔正〕 Be careful. The temperature of the water is ninety degrees above zero.
〔析〕 over 与 above 在作为比某物高的意思时有时可以互换。但在垂直方向上的高矮时,即正上方时则要用above.而泛指上方时用over.
53.〔误〕 The Dead Sea is under the sea level. 〔正〕 The Dead Sea is below the sea level.
〔析〕在垂直下方要用below.也就是讲above与below互为反意词,over与under也是反意词。
54. 〔误〕 There is a big tree in the front of the house. 〔正〕 There is a big tree in front of the house.
in front of 是在物体外部的前面,而in the front of 是在物体内部的前面,如:The driver sits in the front of the bus.
55.〔误〕 It took them two days to walk across the forest. 〔正〕 It took them two days to walk through the forest.
〔析〕 across 作为介词有两个主要意思:① 横过,如:I want to walk across the street.②对面,如:There is a post office across the street,而through 多用于三维空间中的穿越。across则多用于平面上的横过。如:The little girl ran across the room to meet her mother.
56. 〔误〕 The sun sets toward the west. 〔正〕 The sun sets in the west.
〔析〕 towards也可用作toward,它主要表达朝向某方向运动,但不一定到达,如:He ran toward(s) the mountain.而在表示方位east, west, north, south 时,其前面要用in。要注意的是这4个词可以用作副词,如:I went south. 也可用作名词,如:I went to the south.也可用作形容词,如:I went to the south part of China.
57. 〔误〕 Can I write the exam paper with ink? 〔正〕 Can I write the exam paper with a pen? 〔正〕 Can I write the exam paper in ink?
〔析〕 with后要加拿得起来放得下的工具,而墨水、颜料等原料则要用in。
58. 〔误〕 Im earlier today. I came here by his car. 〔正〕 Im earlier today. I came here in his car.
〔析〕在交通工具前加介词by,但不能再有任何指示代词或冠词,否则要改换相应的介词。by taxi=in a taxi by train=in a train by bicycle=on a bicycle by ship=on a ship
59. 〔误〕 A lot of French wines are made of grape. 〔正〕 A lot of French wines are made from grape.
〔析〕 made of 是指由原材料到成品过程中原材料未发生质地的变化,而发生了某种变化则要用from,如:The desk was made of hard wood.
60.〔误〕 This is a good dictionary in English grammar. 〔正〕 This is a good dictionary on English grammar.
〔析〕关于某方面的书籍、报告等有两个介词,其中on表示某专业用书,about则为某方面的普通读物,如:This is a book about physics.即物理科普知识。
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七年级语文上册都有哪些常错的语病题呢?接下来是读文网小编为大家带来的关于七年级上册语文的语病错题集,希望会对大家有所帮助。
结构不一致
1.我们既反对政治观点错误的小说,也反对只有正确的政治观点没有艺术力量的所谓“标语口号式”的倾向。 × 后句应该跟前句对称,“也反对……的小说”
2.目前可用于工业煤代油燃烧的洁净煤技术,主要有水煤浆技术、煤气化技术和粉煤燃烧。 ×
后一个“燃烧”后应加“技术”
两面和一面:可能不对应
例1.我们能不能培养出“四有”新人,是关系到我们党和国家前途命运的大事,也是教育战线的根本任务。 ×
“根本任务”与“能不能”是一面和两面,去掉“不能”
例2.储蓄所吸收储蓄额的高低对国家流动资金的增长有重要的作用,因而动员城乡居民参加储蓄是积累资金的重要手段。 √
“重要的作用”可以包含正反两方面,所以与“高低”两面对两面
1.参加世界杯十强赛的国脚们清楚,一个球的输赢,不仅关系个人的颜面,而且关系到祖国的荣誉。×
“输赢”与“颜面”都是两面,“荣誉”是光荣的名誉,是一面。
2.我市在西部大开发的战略规划中能否抓住机会,迅速发展,关键在于加速培养一批人才。×
“能否”和“加速培养”是两面和一面
是否搭配(特别是关联词语)
例1.《消费者权益保护法》深受广大消费者所欢迎,因为它强化了人们的自我保护意识,使消费者的权益得到最大限度的保护。 ×
“受”与“所”不能搭配,删去“所”或把“受”改为“为”
例2.无论干部和群众,毫无例外,都必须遵守社会主义法制。
“无论”跟“和”不搭配,改“无论……还是”
1.现在我们的一部分青年连现代中国革命史还不知道,对他们说,“忘记过去就意味着背叛”,这不等于白说吗? × “连”应该与“都”搭配,不能跟“还”
2.根据法庭对黑哨事件的调查结果和法制办出具的书面证明材料看,他是在未被采取强制措施时交代了自己的罪行的。 × “根据”不能跟“看”搭配,可改为“从”
3.如果我们的想象脱离了客观实际,反而可能使我们陷入唯心主义的泥潭而不能自拔,给工作和学习带来损失。 × 把“反而”改“就”,跟“如果”搭配
4.所谓综合,就是把部分结合成整体,它不只是各部分简单相加,而是实现事物各部分的或各方面的本质联系。 × 不只是……而且是…… 不是……而是…… 此处用后者
关系可能用错(或意思)
例1.3月17日,6名委员因受贿丑闻被驱逐出国际奥委会。第二天,世界各大报纸关于这起震惊国际体坛的事件都作了详细报道。 ×
“关于”:表关涉; 改“对于”:引出对象
或把“关于……事件”这个状语放在句首,“关于”不能在句中
例2.不管气候条件和地理环境都极端不利,登山队员仍然克服了困难,胜利攀登到顶峰。 ×
前后句是转折关系,把“不管”改为“尽管”
例3.他们在遇到困难的时候,并没有消沉,而是在大家的信赖和关怀中得到了力量,树立了克服困难的信心。 × 把“在”改“从”
1.即将遨游太空的“神舟”号载人宇宙飞船,是我们国家自行研制的,它不能不为国人感到骄傲。 ×
“为”改为“使”
2.有些人把群众看成阿斗,反而把自己看成了不起的天才。 ×
反而:跟上文意思相反或出乎预料和常情 此处是并列关系,用“而”就对了
3.改革公费医疗制度、实施医疗保险的问题,对于广大人民群众并不是一下子就能愉快接受的,这需要政府部门做好宣传解释工作。 ×新课 标 第 一网
要注意“对于”的主客体关系,把“群众”与“问题”换个位置
三年前,电脑“上网”对人们可能是陌生的,但对今天的小学生都是很熟悉的了。 ×
“人们”对“上网”陌生
4.他们深为党中央对海南人民的关怀而感动,也更深刻地认识到搞活经济要靠改革,靠发展生产致富,不能靠歪门邪道。 ×
“为wèi……而”,“为”后面应跟目的 此处可改“为wéi……所”
5.兴建平昌到永宁的高速公路是振兴我地区经济的大事,我们不应再迟疑:对于公路预经的自然保护区,完全可以统筹管理。 × 改“至于”:另起一个话题
6.和靠文字传递信息的报刊杂志相比,电视无疑是一种更现代化的传播媒体。 ×
“报刊杂志”是非现代化的,所以后面不能用“更”
7.造纸厂排出的废物,使周围的水变得又黑又臭,许多水生动植物大量减产以致绝产。 ×
“减产”与“绝产”之间是程度的递进,用“以至”
位置可能错误(关联词语连接句子的不同部分,相同部分放在它的外面)
例:由于《古文观止》具有特色,自问世以后近三百年来,广为传播,经久不衰,至今仍不失为一部有价值的选本。 ×
几个分句的主语都是“古文观止”,所以“由于”应放在“《古文观止》”的后面
1.当前,国际反恐怖合作使带有明显恐怖主义印记的“东突”势力处境十分尴尬,一方面他们对本•拉登恐怖势力被击毁痛心不已,另一方面又不得不表示对美国军事打击的支持,试图拉来其与本•拉登恐怖势力的距离。 ×
两个分句的主语都是“他们”,所以“他们”应该放在“一方面”的前面
2.在今后很长一段时间内,我国因为人口基数大,劳务市场劳动力供大于求的矛盾将长期存在。 ×
两个分句的主语是“我国”和“矛盾”,不一样,所以“因为”放到“我国”之前
3.文化公园经过一年的精心打造,总投资近千万元的大型山体浮雕《灯会溯源》即将完工,并于春节灯会期间正式向游人开放。 ×
“经过……打造”作状语,“文化公园”缺少谓语,把“经过”放到句首,做全句的状语
4.他能够考上研究生,主要是由于他平时的刻苦钻研和老师的认真指导。 ×
“由于”表原因时,只能放在前半句中
5.虽然他们在寻找革命真理和探索革命道路中经历了许多痛苦、挫折,但始终信心百倍,老而弥坚。×
两个分句的主语都是“他们”,“他们”应到“虽然”的外面
6.近些年来,国外教育机构不仅在寻求与我国包括民办高校在内的各类学校合作,而且许多人也开始将注意力转向民办教育,并以此作为创业的新起点。 ×
两个分句主语不一致,把“不仅”放到“国外教育机构”的前面
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七年级上册语文有哪些题会常犯的错误呢?最好我们能分析一下。下面是读文网小编为大家带来的关于七年级上册语文的错题及其分析,供大家参考。
一、读音
1. 加点字注音错误的一项是( )
A惟妙惟肖(xiào)坦荡如砥(dǐ)辗转反侧(zhǎn)称心如意(chèn)
B妄自菲薄(bó)潜移默化(qián)辙乱旗靡(mǐ)挑拨离间(jiàn)
C装模作样(mó)峰回路转(zhuǎn)沁人心脾(qìn)赫赫有名(hè)
D曲径通幽(qū)上窜下跳(cuàn)随声附和(hè)万籁俱寂(lài)
错选答案:D
错选原因:“装模作样”的“模”的读音是“mú”,“上窜下跳”的“窜”的读音 “cuàn”。
正确答案:C
2.下列词语中加点字的注音有误的一项是( )
A差使(chāi)颠簸(bǒ)懦弱(nuò) 随声附和(hè)
B蹒跚(pán) 不屑(xiè) 热忱(chén)惟妙惟肖(xiào)
C脉络(mài) 狭隘(ài) 混浊(hún)相形见绌(chù)
D粘贴(zhān) 执拗(niù) 恣肆(zì) 锐不可当(dāng)
错选答案:A
错选原因:“颠簸”的“簸”的读 “bǒ”不是“bō”。“混浊”的“混”字读“hùn”。
正确答案:C
小结:
容易读错的字音多为(1)多音字,如:“处决、订正、间隙、强迫、中看、潜移默化、字帖、挑拨离间、随声附和”等;(2)易读错的字,如“卑劣、订正、逮捕、一幅、根茎、剔除、弦乐、锐不可当、膝盖、脑髓、喷香、脊梁”等;(3)生僻的字,如“蓦地、永垂不朽、觥筹交错、瓦楞、颠簸”等。
措施:学生对结构复杂字的字音、字型掌握不牢,需多加练习。
二、字形
1. 字形有误的一组是()
A鄙薄修葺畸形竹篾
B阔绰倦怠颧骨游弋
C隔阂滑稽琐屑忌讳
D害臊沟壑恳荒无赖
错选答案:A或C
错选原因:主要是没有掌握词的意思,不了解形声字。“恳荒”的“恳”应写为“垦”。同学们误认为“竹篾”的“篾”和“隔阂”的“阂”是错误的。
正确答案:D
2.下列语句中没有错别字的一项是()
A不论学习哪种知识,都应该辩伪去妄,掌握事物的真谛。
B模拟体育加试,同学们取得了很好的成绩,我们应再接再励,攀登高峰。
C北京办奥运既展示传统文化又展现精神风貌,可谓两全齐美。
D工匠们就地取材,建造了世界上最早的独拱石桥——赵州桥。
错选答案:C或B
错选原因:选错的原因是不知道“再接再励”的“励”应写成“厉”;“两全齐美”的“齐”应写成“其”。
正确答案:D
措施:学生对汉字的正确书写有待于提高,多加练习
三、语素义和词义
1.加点字解释有误的一组是()
A热忱(情意)阅历(经历)爽快(率直)莫名其妙(说出)
B遵循(遵守)欣赏(欣赏)敏捷(快)无人问津(渡口)
C气派(风度)呆滞(不流通)琐屑(卑微)一鼓作气(击鼓)
D秀颀(高)嘹亮(响亮)皎洁(白而亮)无精打采(提)
错选答案:B或D
错选原因:不知“琐屑”中“琐”的意思是“细小、琐碎”的意思。不知“无人问津”“无精打采”两个词语中加点字的正确意思。
正确答案:C新 课标 第 一网
2.加点字字义相同的一项是( )
A沉浸沉静
B飞翔飞跃
C宽慰宽裕
D敏感 敏捷
错选答案:B
错选原因:此题做错的同学较多。大部分同学选B,他们不知“飞翔”中“飞”的意思是“(鸟、虫等)鼓动翅膀在空中活动”,“飞跃”中“飞”的意思是“像飞似的”。
正确答案:D 两个词语中的“敏”都是“快”的意思。
3.加点词解释正确的是( )
A他一闲下来,便感觉到无聊。
无聊:言谈、行动等没有意义而使人讨厌
B杜甫的诗深受后人推崇。
推崇:崇敬
C商店里琳琅满目的商品摆放得错落有致。
错落有致:交错纷杂,很有秩序。
D民主战士闻一多先生面对敌人的枪口大声疾呼:民主、自由。
大声疾呼:大声呼喊,提醒人们注意。
错选答案:C或A
错选原因:有些同学选C,主要是他们不知“错落有致”的意思是“交错纷杂,很有情趣”;有的同学选A,是因为他们没有了解“无聊”一词在这句话中的意思是“由于清闲而烦闷”。
正确答案:D
措施:让学生掌握根据语言情景准确、得体的使用常用词语
四、词语运用www.
1.能使下列语意顺畅、连贯的一组短语是:( )
实施素质教育有赖于、或者说根本受制于教育工作者的责任。有人说,孩子们的心就像一块奇妙的大地,播下 ① 的种子,就会获得行为的收获,播下②的种子,就会获得习惯的收获,播下 ③ 的种子 ,就会获得性格的收获,播下④的种子,就会获得命运的收获。从这个意义上来说,教育工作者确实是主宰每一个学生命运的人。
A①思想②性格③行为④习惯
B①思想②行为③习惯④性格
C①行为②习惯③性格④思想]
D①性格 ②行为③习惯④思想
错误选择:A
错选原因:本题不同于同义词比较,属于词语前后环环相扣的问题,本身有一定的逻辑关系,不能颠倒,所以选择A是不对的。
正确答案:B
2.根据句意依次填写词语最恰当的是( )
(1)傍晚时候,上灯了,一点点黄晕的光,( )出一片安静而和平的夜。
(2)我们上了轮船,离开栈桥,在一片( )的好似绿色大理石桌面的海上驶向远处。
(3)汽车在望不到边际的高原上奔驰,( )你的视野的,是黄绿错综的一条大毡子。
(4)沙丘的移动虽然慢,可是所到之处,森林全被( ),田园全被埋葬,城郭变成丘墟。
A烘托 寂静 进入 摧毁
B映衬 平静 进入 毁坏
C烘托 平静 扑入 摧毁
D映衬 寂静 扑入 毁坏
错误选择:A
错选原因:此题考查“根据语言环境选择词语”的能力。(1)句中“一点点黄晕的光”是柔和的,只能作为陪衬,“映衬”的意思是“映照、衬托”,两个事物之间没有主次之分;(2)句中“好似绿色大理石桌面……”突出了“平”而非“寂”;(3)句依据“汽车在望不到边际的高原上奔驰”这一语境,用“扑入”更加生动形象;(4)句中“摧毁”比“毁坏”更能突出沙丘对人类危害的严重程度。属于词义的轻重差别。
正确答案:C
3.下列句中横线上,依次填入词语最恰当的一项是()
(1)包兰铁路通车以来,火车在沙漠上行驶,从来没有因为风沙的 而发生事故。
(2)农民兄弟要做好准备,防止害虫 农作物。
(3)由于长城外的风沙 , 榆林城也受到袭击。
(4)这个区域不断受到风沙的 ,有些部分逐渐变成荒漠了。
A侵袭 侵害 侵入 侵占
B侵入 侵害 侵袭 侵占
C侵占 侵入 侵袭 侵害
D侵害 侵占 侵入 侵袭
错误选择:B
错选原因:此题考查的是考生的同义词的辨析能力。这组词是比较难区分的,四个词语的第一个字都是一样的,所以可以采取存同求异的方法。“侵入”是进入内部;“侵害”是侵入而损害;“侵袭”是侵入并袭击;“侵占”是指非法占有别人的财产。根据语境,应选择A。
正确答案:A
4.下列句子中加点的成语使用不正确的一项是( )
A这行云流水般的歌声使所有在场的听众获得了极大的艺术享受。
B一方困难百方支援,被洪水冲得囊空如洗的灾区又重建了家园。
C这么好的天气去旅游,同学们可以在大自然中尽情地享受天伦之乐。
D凡是优秀的演员,总能把剧中人物的内心世界表演得惟妙惟肖。
错误选择:B
错选原因:此题考查的是考生对成语的运用能力。由于学生对B项的成语的意思即使用习惯不清楚,故选择了B,小词大用了,且使用不当。B项中的“囊空如洗”多形容贫困或一时缺钱;C项中的“天伦之乐”指家庭之乐;D项中的“惟妙惟肖”指描绘或摹仿得非常像,所以这里不妥。
正确答案:A
措施:要学会正确使用句式,根据语言情景进行仿写、续写、改写、做到语言准确、简明、连贯、流畅。
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初二英语易错词汇都有哪些呢?下面是读文网小编为大家带来的关于初二英语易错词汇归纳,供大家参考。
1. clothes, cloth, clothing
clothes统指各种衣服,谓语动词永远是复数, cloth指布,为不可数名词 clothing 服装的总称,指一件衣服用a piece of, an article of
2. incident, accident
incident指小事件, accident指不幸的事故He was killed in the accident.
3. amount, number
amount后接不可数名词, number后接可数名词 a number of students
4. family, house, home
home 家,包括住处和家人,house房子,住宅,family家庭成员. My family is a happy one.
5. sound, voice, noise
sound自然界各种各样的声音,voice人的嗓音,noise噪音I hate the loud noise outside.
6. photo, picture, drawing
photo用照相机拍摄的照片,picture可指相片,图片,电影片,drawing画的画 Let's go and see a good picture.
7. vocabulary, word
vocabulary词汇,一个人拥有的单词量,word具体的单词He has a large vocabulary.
8. population, people
population人口,人数,people具体的人 China has a large population.
9. weather, climate
weather一天内具体的天气状况,climate长期的气候状况 The climate here is not good for you.
10. road, street, path, way
road具体的公路,马路,street街道,path小路,小径,way道路,途径
take this road; in the street, show me the way to the museum.
11. course, subject
course课程(可包括多门科目),subject科目(具体的学科)a summer course
12. custom, habit
custom传统风俗,习俗,也可指生活习惯,后接to do, habit生活习惯,习惯成自然,后接of doing. I've got the habit of drinking a lot.
13. cause, reason
cause 指造成某一事实或现象的直接原因,后接of sth./doing sth,reason用来解释某种现象或结果的理由,后接for sth./doing sth. the reason for being late
14. exercise, exercises, practice
exercise运动,锻炼(不可数),exercises练习(可数),practice(反复做的)练习 Practice makes perfect.
15. class, lesson
作"课"解时,两者可以替换.指课文用lesson. 指班级或全体学生用class. lesson 6; class 5
16. speech, talk, lecture
speech指在公共场所所做的经过准备的较正式的演说,talk日常生活中的一般的谈话,讲话,lecture学术性的演讲,讲课 a series of lecture on…
17. officer, official
officer部队的军官,official政府官员 an army officer
18. work, job
二者均指工作。work不可数,job可数 a good job
19. couple, pair
couple主要指人或动物,pair多指由两部分组成的东西 a pair of trousers
20. country, nation, state, land
country侧重指版图,疆域,nation指人民,国民,民族,state侧重指政府,政体,land国土,国家 The whole nation was sad at the news.
21. cook, cooker
cook厨师,cooker厨具 He is a good cook.
22. damage, damages
damage不可数名词, 损害,损失; damages复数形式, 赔偿金 $900 damages
23. police, policeman
police警察的总称,后接复数谓语动词,policeman 指某个具体的警察 The police are questioning everyone in the house.
24. problem, question
problem常和困难连系,前面的动词常为think about, solve, raise,question常和疑问连系,多和ask, answer连用
25. man, a man
man人类,a man一个男人 Man will conquer nature.
26. chick, chicken
二者均可指小鸡,chicken还可以当鸡肉 The chicken is delicious.
27. telegram, telegraph
当电报解时,telegram指具体的,telegraph指抽象的 a telegram, by telegraph
28. trip, journey, travel, voyage
travel是最常用的,trip指短期的旅途,journey指稍长的旅途,voyage指海上航行 a three-day trip
29. sport, game
sport多指户外的游戏或娱乐活动,如打球,游泳,打猎,赛马等;game指决定胜负的游戏,通常有一套规则 His favorite sport is swimming.
30. price, prize
price价格,prize奖,奖品,奖金 win the first prize The price is high/low.
31. a number of, the number of
a number of许多,谓语动词用复数。the number of…的数目,谓语动词用单数。The number of students is increasing.
32. in front of, in the front of
in front of范围外的前面,in the front of范围内的前面 In the front of the room sits a boy.
33. of the day, of a day
of the day每一天的,当时的,当代的, of a day暂时的,不长久的 a famous scientist of the day
34. three of us, the three of us
three of us我们(不止三个)中的三个,the three of us我们三个(就三个人)The three of us---Tom, Jack and I went to the cinema.
35. by bus, on the bus
by bus表手段,方式,不用冠词,on the bus表范围 They went there by bus.
36. for a moment, for the moment
for a moment 片刻,一会儿,for the moment暂时,一时 Thinking for a moment, he agreed.
37. next year, the next year
next year将来时间状语,the next year过去将来时间状语 He said he would go abroad the next year.
38. more than a year, more than one year
more than a year一年多,more than one year超过一年(两年或三年等)
39. take advice, take the(one's) advice
take advice征求意见,take the advice接受忠告 He refused to take the advice and failed again.
40. take air, take the air
take air传播,走漏,take the air到户外去,散步 We take the air every day.
41. in a word, in words
in a word总之,一句话, in words口头上 In a word, you are right.
42. in place of, in the place of
in place of代替,in the place of在…地方 A new building is built in the place of the old one.
43. in secret, in the secret
in secret秘密地,暗自地,偷偷地,一般用作状语;in the secret知道内情,知道秘密,一般用作表语 My mother was in the secret from the beginning.
44. a girl, one girl
a girl可泛指所有女孩, one girl一个女孩 Can one girl carry such a big box?
45. take a chair, take the chair
take a chair相当于sit down坐下,take the chair开始开会
46. go to sea, by sea, by the sea
go to sea当海员,出航,by sea乘船,由海路, by the sea在海边 go by sea
47. the doctor and teacher, the doctor and the teacher
the doctor and teacher指一个人,既是医生又是老师,the doctor and the teacher两个人,一个医生和一个老师 the doctor and teacher is
48. in office, in the office
in office在职的,in the office在办公室里 He is in office, not out of office.
49. in bed, on the bed
in bed卧在床上,on the bed在床上 The book is on the bed. He is ill in bed.
50. in charge of, in the charge of
in charge of管理,负责照料, in the charge of由……照料 He is in charge of the matter. The matter is in the charge of her.
51. in class, in the class
in class在课上,in the class在班级里 He is the best student in the class.
52. on fire, on the fire
on fire着火,on the fire在火上 Put the food on the fire. The house is on fire.
53. out of question, out of the question
out of question毫无疑问的,out of the question不可能的
54. a second, the second
a second又一,再一,the second第…… He won the second prize.
55. by day, by the day
by day白天,by the day按天计算 The workers are paid by the day.
56. the people, a people
the people指人,a people指民族 The Chinese is a peace-loving people.
57. it, one
it同一物体,one同类不同一 I lost my pen. I have to buy a new one.
58. that, this
that指代上文所提到的,this导出下文所要说的 I was ill. That's why…
59. none, nothing, no one
none强调有多少,nothing, no one强调有没有,nothing指物,no one指人
--- How many…/How much…? --- None.
60. anyone, any one
anyone指人,不能接of,any one指人物均可,可接of any one of you
61. who, what
who指姓名或关系,what指职业或地位 What is your dad? He is a teacher.
62. what, which
what的选择基础是无限制的,which在一定范围内进行选择 Which do you prefer, bananas or apples?#p#副标题#e#
63. other, another
other后接名词复数,another后接名词单数 other students, another student
64. not a little, not a bit
not a little非常,not a bit一点也不 I'm not a bit tired. 我一点儿也不累。
65. many, much, a lot of
many和可数名词连用,much和不可数名词连用,a lot of可数,不可数均可,但不用于否定句 I haven't many books.
66. much more…than, many more…than
much more…than后接形容词或不可数名词,many more…than后接可数名词 many more people, much more water, much more beautiful
67. no, not
no=not a/any no friend=not a/any friend no water=not any water
68. no more than, not more than
no more than相当于only,仅仅,只有,not more than 至多,不超过
69. majority, most
majority只能修饰可数名词,most可数不可数均可 the majority of people
70. by oneself, for oneself, to oneself, of oneself
by oneself单独的,独自的,for oneself为自己,to oneself供自己用的,of oneself 自行的,自动的 The door opened of itself.
71. at all, after all
at all根本,全然, after all到底,毕竟 After all he is a child.
72. tall, high
tall常指人或动物,high常指物体 He is tall.
73. fast, quickly
fast侧重于指人或物体具有运动速度快的特点,quickly侧重指某事完成或发生的快 run fast, answer the question quickly
74. high, highly
high具体的高,highly抽象的高,高度的 think highly of
75. healthy, healthful
healthy健康的,健壮的,healthful有益于健康的 healthful exercise
76. sleeping, asleep, sleepy
sleeping正在睡觉,asleep睡着,熟睡,只能做表语,sleepy困的,有睡意的 a sleeping baby The baby is asleep. I'm sleepy.
77. gold, golden
gold指真金制品,golden指金色的,但金鱼用gold fish a gold ring
78. most, mostly
most用于表感受的肯定句中,相当于very,当大部分,大多数解时是形容词或名词,mostly大部分,是副词 most people, the people are mostly…
79. just, very
just表强调时是副词,作状语,very表强调时是形容词,用作定语 the very man, just the man
80. wide, broad
wide侧重于一边到另一边的距离,broad侧重于幅面的宽广broad shoulders
81. real, true
real真的,真实的,指的是事实上存在而不是想象的,true真的,真正的,指的是事实和实际情况相符合 real gold, a true story
82. respectful, respectable
respectful尊敬,有礼貌,respectable可敬的,值得尊敬的 be respectful to the aged
83. outwards, outward
二者均可用作副词,表示向外,外面,outward还可用作形容词 an outward voyage
84. pleasant, pleased, pleasing
pleasant常用作定语,pleased, pleasing常用作表语,pleased主语常为人,pleasing主语常为物 a pleasant trip The trip is pleasing.
85. understanding, understandable
understanding明白事理的,能体谅的,understandable 可理解的,能够懂的 an understanding girl, an understandable mistake
86. close, closely
close接近,靠近,closely紧紧地,紧密地 closely connected, stand close
87. ill, sick
ill做表语,sick定,表均可 a sick boy
88. good, well
good形容词,well副词,但指身体状况是形容词 He is well again.
89. quiet, silent, still
quiet安静的,可以发出小的声音,silent不发出声音,但可以动,still完全不动,完全无声响 He stand there still. 他站在那儿,一动不动,也不说话。
90. hard, hardly
hard努力,hardly几乎不 work hard I can hardly believe it.
91. able, capable
able与不定式to do连用,capable与of连用 He is capable of doing…
92. almost, nearly
二者均为"几乎,差不多" 和否定词连用用almost almost nobody
93. late, lately
late迟,晚,lately最近,近来 I haven't seen him lately.
94. living, alive, live, lively
living, alive, live均为活着的,living定表均可,alive定表均可,定语后置,live只能做定语,lively意为活波的 all the living people=all the people alive
95. excited, exciting
excited使人兴奋的,exciting令人兴奋的 I'm excited. The news is exciting.
96. deep, deeply
deep具体的深,deeply抽象的深,深深地 deeply moved, dig deep
97. aloud, loud
aloud出声地,loud大声地 read aloud(出声地读)
98. worth, worthy
二者均为值得,worth后接doing,worthy后接to be done, of being done
It is worth visiting. = It's worthy to be visited. = It's worthy of being visited.
99. bad, badly
bad形容词,badly副词,不好,但与need, want, require连用为"很,非常" go bad I need the book badly.
100. before long, long before
before long不久以后,long before很久以前 not long before = before long
101. quite, rather
quite完全地,相当于completely, rather修饰比较级 quite impossible
102. happy, glad
happy高兴,幸福,定表均可,glad高兴,只能做表语 a happy girl
103. instead, instead of
instead是副词,放在句首或句末,instead of是介词短语,放在句中He didn't see a film. Instead he watched TV. He watched TV instead of seeing a film.
104. too much, much too
too much 后接不可数名词,much too后接形容词 much too heavy
105. be about to, be going to, be to do
be about to表最近的将来,后面不接时间状语,be going to 侧重打算,想法,be to do侧重意志,计划,安排I'm to meet him.(含双方事先约好的意思)
106. raise, rise
raise及物动词,rise不及物动词 The sun rises in the east.
107. bring, take, carry, fetch
bring拿来,take带走,carry随身携带,fetch去回这一往返动作 fetch a box of chalk
108. spend, take, pay, cost
spend人做主语,花钱,花时间; spend…on sth./in doing sth; take物做主语,花时间; pay人做主语,花钱,pay for; cost物做主语,花钱
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物理中考快到了,我们一定要认真复习,特别是那些易错的知识点。接下来是读文网小编为大家带来的关于2017年中考物理易错的知识点汇总,希望会给大家带来帮助。
1.密度不是一定不变的。密度是物质的属性,和质量体积无关,但和温度有关,尤其是气体密度跟随温度的变化较为明显。
2.平均速度只能是总路程除以总时间。求某段路上的平均速度,不是速度的平均值,只能是总路程除以这段路程所花费的时间,包含中间停留的时间。
3.物理运动状态改变一定受到了力,受力不一定改变运动状态。力是改变物体运动状态的原因。受力也包含平衡力,此时运动状态就不变。
4.惯性大小和速度无关。惯性大小只和质量有关。速度越大只能说明物体动能大,能够做的功越多,并不是惯性越大。
5.平衡力和相互作用力的区别:平衡力作用在一个物体上,相互作用力作用在两个物体上。
6.惯性是属性不是力。不能说受到,只能说具有,由于。
7.月球上弹簧测力计、天平都可以使用,太空失重状态下天平不能使用而堂皇测力计还可以测拉力等除重力以外的其它力。
8.两个物体接触不一定发生力的作用。要看有没有挤压,相对运动条件等。
9.动滑轮一定省一半力。只有沿竖直或者水平方向拉,才能省一半力。
10.强压的受力面积是接触面积。单位是m2。注意接触面积是一个还是多个,更要注意单位换算:25p*2+10-4m2。
11.液体压强跟液柱的粗细和形状无关,只跟液体的深度有关。深度是指液面到液体内某一点的距离,不是高度。固体压强先运用F=G计算压力,在运用P=F/S计算压强,液体压强先运用P=ρgh计算压强,再运用F=PS计算压力(注意单位,对于柱体则两种方法可以通用)。
12.额定功率和额定电压是固定不变的,但实际电压和实际功率是变化的。但是在变化时,电阻是不变的。可根据R=U2/P计算电阻。
13.有力不一定做功。有力有距离,并且力距离要对应才做功。
14.简单机械的机械效率不是固定不变的。滑轮组的机械效率除了跟动滑轮的重力有关外还跟所提升物体的重力有关,物体越重,拉力也越大,机械效率越高,但滑轮的重力不变。
15.物体匀速水平运动时,动能和势能不一定不变。此时还要考虑物体的质量是否发生变化,例如洒水车,投救灾物的飞机。
16.分子间的引力和斥力是同时存在,同时增大和减小。只是在不同的变化过程中,引力和斥力的变化快慢不一样,导致最后引力和斥力的大小不一样,最终表现为引力和斥力。
17.物体内能增大,温度不一定升高(晶体熔化,液化沸腾);物体内能增加,不一定是热传递(还可以是做功);物体吸热,内能一定增加;物体吸热温度不一定升高(晶体熔化,液体沸腾);物体温度升高,内能不一定升高(还和物体的质量等因素有关);物体温度升高,不一定是热传递(还可以是做功)
18.内能和温度有关,机械能和物体机械运动情况有关,它们是两种不同形式的能。物体一定有内能,但不一定有机械能。
19.比热容是物质的一种属性,是固定不变的。比热容越大:吸收相同热量,温度变化量小(用人工湖调节气温);升高相同温度,吸收热量越多(用水做冷却剂)。
20.电路中有电流就一定有电压,但有电压不一定有电流(电路还得闭合)。
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2017年中考数学有哪些易错点是需要我们格外的注意呢?接下来是读文网小编为大家带来的关于2017中考数学的60个易错点总结,希望会给大家带来帮助。
函数(8个)
易错点1:各个待定系数表示的的意义。
易错点2:熟练掌握各种函数解析式的求法,有几个的待定系数就要几个点值。
易错点3:利用图像求不等式的解集和方程(组)的解,利用图像性质确定增减性。
易错点4:两个变量利用函数模型解实际问题,注意区别方程、函数、不等式模型解决不等领域的问题。
易错点5:利用函数图象进行分类(平行四边形、相似、直角三角形、等腰三角形)以及分类的求解方法。
易错点6:与坐标轴交点坐标一定要会求。面积最大值的求解方法,距离之和的最小值的求解方法,距离之差最大值的求解方法。
易错点7:数形结合思想方法的运用,还应注意结合图像性质解题。函数图象与图形结合学会从复杂图形分解为简单图形的方法,图形为图像提供数据或者图像为图形提供数据。
易错点8:自变量的取值范围有:二次根式的被开方数是非负数,分式的分母不为0,0指数底数不为0,其它都是全体实数。
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知识点存在一定的盲区,初二物理有哪些易错的知识点呢?接下来是读文网小编为大家带来的初二物理易错的知识点,供大家参考。
1.物体的受力分析
(1)确定所研究的物体,分析周围物体对它产生的作用,不要分析该物体施于其他物体上的力,也不要把作用在其他物体上的力错误地认为通过“力的传递”作用在研究对象上.
(2)按“性质力”的顺序分析.即按重力、弹力、摩擦力、其他力顺序分析,不要把“效果力”与“性质力”混淆重复分析.
(3)如果有一个力的方向难以确定,可用假设法分析.先假设此力不存在,想像所研究的物体会发生怎样的运动,然后审查这个力应在什么方向,对象才能满足给定的运动状态.
2.力的合成与分解
(1)合力与分力:如果一个力作用在物体上,它产生的效果跟几个力共同作用产生的效果相同,这个力就叫做那几个力的合力,而那几个力就叫做这个力的分力.
(2)力合成与分解的根本方法:平行四边形定则.
(3)力的合成:求几个已知力的合力,叫做力的合成. 共点的两个力(F 1 和F 2 )合力大小F的取值范围为:|F 1 -F 2 |≤F≤F 1 +F 2 .
(4)力的分解:求一个已知力的分力,叫做力的分解(力的分解与力的合成互为逆运算).
在实际问题中,通常将已知力按力产生的实际作用效果分解;为方便某些问题的研究,在很多问题中都采用正交分解法.
3.共点力的平衡
(1)共点力:作用在物体的同一点,或作用线相交于一点的几个力.
(2)平衡状态:物体保持匀速直线运动或静止叫平衡状态,是加速度等于零的状态.
(3)★共点力作用下的物体的平衡条件:物体所受的合外力为零,即∑F=0,若采用正交分解法求解平衡问题,则平衡条件应为:∑Fx =0,∑Fy =0.
(4)解决平衡问题的常用方法:隔离法、整体法、图解法、三角形相似法、正交分解法等等.
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2024高中数学知识点总结
数学训练了我们的逻辑思考能力,从理解基本原理到推导复杂的定理都离不开合理的推理和证明过程。下面是小编为大家带来的高中数学知识点总结,希望大家能够喜欢!快来看看吧!
利用导数求函数单调性的基本方法:设函数yf(x)在区间(a,b)内可导,(1)如果恒f(x)0,则函数yf(x)在区间(a,b)上为增函数;(2)如果恒f(x)0,则函数yf(x)在区间(a,b)上为减函数;(3)如果恒f(x)0,则函数yf(x)在区间(a,b)上为常数函数.
利用导数求函数单调性的基本步骤:①求函数yf(x)的定义域;②求导数f(x);③解不等式f(x)0,解集在定义域内的不间断区间为增区间;④解不等式f(x)0,解集在定义域内的不间断区间为减区间.
反过来,也可以利用导数由函数的单调性解决相关问题(如确定参数的取值范围):设函数yf(x)在区间(a,b)内可导,
(1)如果函数yf(x)在区间(a,b)上为增函数,则f(x)0(其中使f(x)0的x值不构成区间);
(2)如果函数yf(x)在区间(a,b)上为减函数,则f(x)0(其中使f(x)0的'x值不构成区间);
(3)如果函数yf(x)在区间(a,b)上为常数函数,则f(x)0恒成立.
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