为您找到与八年级上册寒假数学作业答案相关的共200个结果:
寒假是指冬季1-2月期间的假期。在放寒假期间,由于寒假放假时间较长,因此根据国家要求,学生在寒假期间必需完成一定的寒假作业量,由校方教师进行布置寒假作业。那么关于八年级上册寒假作业答案你了解多少呢?下面是读文网小编收集整理的八年级上册寒假作业答案以供大家学习。
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在寒假结束之后,五年级的学生也应该写完自己的寒假作业了,那就来对一下正确的答案吧!下面是读文网小编收集整理的五年级上册寒假作业答案以供大家学习。
以上就是读文网小编为大家收集的五年级上册寒假作业答案的全部内容,希望对你有帮助。
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在丰富多彩的寒假生活里尽情享受每一天吧。下面是读文网小编收集整理的人教版八年级上册数学寒假答案2015以供大家学习。
人教版八年级上册数学寒假答案2015
以上就是小编分享的人教版八年级上册数学寒假答案2015全部内容,相信这些对你会有用的。
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寒假即将到来,老师又要布置寒假作业了,一定数量的寒假作业是少不了的。为帮助同学们在完成作业后快速核对,读文网小编整理了人教版五年级上册数学寒假作业答案,供大家参考!
一、填空: 1、5,17 2、40 3、390
二、图形计算: 37.5
三、解答题: 1、4 2、3120 3、48
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做好小学六年级数学的寒假作业,对六年级的学生来说有着重要的意义。下面是读文网小编收集整理的小学六年级数学上册寒假作业答案以供大家学习。
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在暑假来临之际,关于学生暑假作业的话题又热了起来,暑假期间学生们少不了要完成一本本老师布置的暑假作业。为方便同学们检查自己做的作业,以下是:八年级(初二)上册寒假作业答案,供大家参考!
勾股数(1) 1.C 2.D 3.60/13cm 4.13 5. 连接B、D,36cm26.C
勾股数(2)1.C 2.B 3.A 4.130 5.24
实数1.A 2.C3.正负根号5 4.2倍根号2 5.05.1
6.(1)2倍根号2 (2)根号3(3)14+4倍根号3(4)6
P22平移与旋转
一:AB二:7.5 60
P23
6.(2)解:∵正△ABC
∴AB=BC
又∵△abd由△ABC旋转
∴△abd≌△ABC
∴AB=BC=AD=dc
∴四边形abcd为菱形(其他的找不到!!!)
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寒假即将到来,大家有什么准备呢?接下来是读文网小编为大家带来的关于八年级英语上册寒假作业,希望会对大家有所帮助。
一. 单项选择。
( )1. He never tells lies, so he is ____ honest boy. It’s not good to be _____ dishonest one.
A. a , an B. an , a C. /, a D. an ,the
( )2. Let’s enjoy the song “Yesterday once more”. It sounds
A. bad B. sadly C. well D. wonderful
( )3. __________ nature reserves _________ us learn more about protecting animals.
A. Studying , helps B Studies , to help
C. Study , helping D Studying, help
( )4. “X plus Y is more than Fifteen percent.” This sentence can also write as “________”
A. X+ Y>15% B. X+Y≥15%
C. X+Y=15% D. X+Y<15%
( )5. If we keep the land, giant pandas will have to live.
A. to take, anywhere B. taking, anywhere
C. to take, nowhere D. taking, nowhere
( )6. He was all wet when he got home because he his umbrella in the underground.
A. took B. forgot C. left D. brought
( )7. I’m very sorry. There’s bread in the fridge. Shall I go and bring some?
A. a few B. few C. a little D. little
( )8. We must tell hunters wild animals.
A. to continue hunting B. to stop to hunt
C. don’t continue hunting D. not to continue hunting
( )9. There is sheep eating grass there.
A. a little B. little C. a few D. few
( )10.The old man is sure of living one hundred years.
A. up B. up to C. more D. older
( )11.The number of pandas is getting ___ because their living areas are becoming farm lands.
A. bigger and bigger B. smaller and smaller
C. more and more D. less and less
( )12.We go there if it tomorrow.
A. don’t; rains B. won’t; rains C. won’t; will rain D. don’t; will rain
( )13.I arrived Shanghai the evening of January 2,2009.
A. at, in B. in, at C. in, on D. from, to
( )14.The sentence structure of “The boy is crying.” Is .
A. S+V B. S+V+P C. S+V+DO D. S+V+IO
( )15.— they are talking to each other!
—Yes. They are really happy to see each other.
A. What excited B. How excited
C. What excitedly D. How excitedly
( )16.You can call me 0512-5123467 or email me lily@126.com.
A. on, at B. at, on C. by, on D. on, on
( )17.The park is full of interesting .
A. wildlives, wildlives B. wildlife, wildlife
C. wildlife, wildlives D. wildlives, wildlife
( )18.Our teacher let Simon forget the door.
A. not, to close B. not to, to close
C. not, closing D. not to, closing
( )19.Don’t worry! The train at 3:30 pm. There is enough time left.
A. leave B. leaving C. leaves D. left
( )20.We found to sleep.
A. difficult to get B. it difficult getting
C. it difficult to get D. that difficult to get
二. 交际英语。
A
A. Me, too.
B. Excuse me.
C. And it is too difficult to find a bus or a taxi.
D. Will you please take my car?
E. That’s all right.
A: ____21___ Why are you looking so worried? What’s wrong?
B: I’ll have to reach the airport before 10:30a.m. But you see, this is a small mountain village here. ___22____I don’t know what to do now.
A: Don’t worry, let me help you.____23____.
B: It’s very kind of you. Thank you for your help.
A: ___24___ By the way, what’s your name, please?
B: Jack Cooper.
A: Nice to meet you, Mr. Cooper!
B: ____25____.
A: Come on!
21.________22.________ 23.________ 24.________ 25.________
三. 完形填空。
While Tom and Mary were on holidays at the seaside, they enjoyed ____26___ the seagulls. They ____27___ a lot about these lovely birds.
They will often come close to you on the beach when they are eating something. If you ____28___ a piece of bread to them, they will soon catch it.
Seagulls swim well, but they don’t often dive ____29___ fish. They are also good at flying ____30____ their large wings. When a seagull is flying, he puts his legs in his body.
Tom often watched them ____31___ close to the ground because he liked the way they ____32___ the air with their wings and brought down their feet before they ____33___ the ground.
Mary liked to see them sliding(滑行) over the ____34___ as they often did, without their ____35___ moving. But she said she didn’t like the noise they made.
( ) 26. A. watch B. to watch C. watching D. watched
( ) 27. A. understood B. learned C. found D. thought
( ) 28. A. throw B. take C. send D. pull
( ) 29. A. of B. above C. for D. into
( ) 30. A. with B. to C. for D. of
( ) 31. A. to come B. came C. come D.to coming
( ) 32. A. help B. beat C. put D. kept
( ) 33. A. hit B. arrived C. got D. touched
( ) 34. A. water B. land C. sky D. ground
( ) 35. A. eyes B. feet C. legs D. wings
四. 阅读理解。
A
Captain Goodfellow
Do your children enjoy interesting stories, funny games, and exciting dances?
Captain Goodfellow will be ready to teach all these things to children at the City Theatre on Saturday morning at 10:00, free.
Films at the Museums#p#副标题#e#
Two American films will be shown on Saturday afternoon at the Museum Theatre. See Broken Window at 1:30. The Workers will be at 3:45. For further information, call 4987898.
International Picnic
Are you tired of eating the same food every day? Come to Central Park on Saturday and enjoy food from all over the world. Delicious and not expensive. Noon to 5:00 p.m.
Take me out to the Ballgame
It’s October, and Saturday night (7:00-9:00) is your last chance to see the Red Birds this year. Get your tickets at the gate. It might be cold. Don’t forget sweaters and Jackets.
Do you want to hear ‘The Zoo’
‘The Zoo’, a popular rock group from Australia, will give their first U. S. concert this Saturday night, at eight in Rose Hall, City College.
( )36. On Saturday morning, you can______.
A. go to watch a ballgame
B. take children to play games at the City Theatre
C. go to the Central Park for a picnic
D. go to the Concert at Rose Hall
( )37. The Red Birds ballgame______.
A. is in the afternoon B. is outside C. is at the gate D. might be cold
( )38. You can eat many different food from all over the world if you _____.
A. go to the City Theatre B. go to the Central Park
C. buy tickets at the gate D. go to see a film
( )39. “The Zoo” is _____.
A. a U. S concert B. a park with many red birds in it
C. a music group D. going to give their last concert
( )40. Mr. Turner wants to have a nice Saturday and have a good rest at night. Which is not possible for him to do?
A. Watching a ball game and having picnic.
B. Having a picnic and seeing a film.
C. Listening to a concert and watching a ballgame.
D. Seeing a film and listening to a concert.
B
Australia has a lot of lovely animals. You cannot find them anywhere else in the world. The most famous ones are kangaroos and koalas(树袋熊). The kangaroo is the symbol of Australia. They have large eyes and ears. They don’t walk, they jump. They use their strong back legs. They can jump at up to 74 kilometers per hour. They can go over nine meters in one jump!
Kangaroo mothers have pouches(育儿袋) to carry their babies. The babies stay inside to get milk and keep warm. Kangaroos are everywhere in Australia. They are on TV, in books and in the shops. The government even wants to put them on passports(护照).
But do you know that millions of kangaroos are killed every year? There are too many of them.
There are about 20 to 25 million kangaroos in Australia. That’s more than the number of people in the country! Some kangaroos go hungry because there is not enough food to eat. They break into farms for food. Farmers are very angry with them. The koala is another famous Australian animal. They look like bears, and have small eyes and big noses. They eat leaves from eucalyptus, where they spend most of their time. Koalas have a special smell. They use it to mark their home—“This is my place, you can’t come in!” Like kangaroos, a koala baby lives in its mother’s pouch. But koalas have fewer places to live in. There are about 100,000 koalas in Australia. There is a law to keep them safe.
( )41. Kangaroos and koalas are the most famous animals in Australia because _______.
A. there are not many of them B. they can’t live in other countries
C. we can’t see them in any other country except Australia
D. they are lovely animals
( )42. Which of the following is WRONG about kangaroos?
A. They can run at up to seventy-eight kilometers per hour.
B. They have large eyes and ears.
C. Kangaroo mothers have pouches to carry their babies.
D. There are many of them in Australia.
( )43. Why does the Australian government kill some kangaroos each year?
A. They can make more money. B. Kangaroos break into farms for food.
C. Kangaroos do not have enough food to eat.
D. There are more kangaroos than people.
( )44. What do koalas use to mark their home?
A Their footprint. B. Their sound. C. Their fur. D. Their smell.
( )45. What is the similarity(相同之处)between a kangaroo and a koala?
A. There are too many of them in Australia.
B. They keep their babies in the mother’s pouch.
D. They can jump very high.
C
The size and shape of your ears show your character more than any other parts of the face. Other parts of the face change shape as we get older, but ears do not change their shape. They only change in size.
Reading people’s character from their ears is an old science. In very old times people thought that a person with big ears had a good and generous character. They thought that a person with pale (nearly white), small ears was dangerous. They also thought that the shape of the ear showed whether a person was musical or not. Today, too, many people believe that the size and the shape of the ear help you know if a person is musical.
Ears are all different, and each characteristic has a meaning. Next time when you look at a person, see if his ears are large or small. Look at the lobes( the lowest part of the ear). Are they attached(连着) to the face? Ears that are always red mean a person may easily get angry, or he/she just has high blood pressure(高血压). Ears that are always cold and pale mean a person has a nervous character. And a big inside hole of the ear means a person is musical.
( )46.In the old times people might ask for help from a person with_______.
A. red ears B. big ears C. small ears D. pale ears
( )47. The passage is mainly about _____.
A. the size of our ears B. musical ears
C. ears which related to characters D. our faces and ears
( ) 48. From the passage, we know ______ change shape as we get older.
A. ears B. hair C. eyes D. teeth
( ) 49. We can guess Beethoven may have _____.
A. pale ears B. white ears
C. small ears D. ears with a big inside hole
( )50. If you are often late for school, you may find the ears of your teacher _________.
A. get bigger B. get smaller C. get colder D. get redder
五. 词汇应用。
A) 根据首字母或汉语提示,写出各单词的正确形式,每空一词。
51. The Chinese g_______ wants to protect these rare birds.
52. Hundreds of natural d_______ happen every year, such as earthquakes, typhoons.
53. Today more and more people understand the i________ of protecting wild animals.
54. Our teacher often e_______ us to learn English well.
55. I am 1.65m tall. What’s your h_______.
56. People ______ (尖叫) when the earthquake happened.
57. Look! Some children are running in all ________ (方向).
58. He was surprised at my sudden ________ (到达).
59. Water ________ (覆盖) most part of the Earth.
60. To take so much food for your trip is ________(不必要的).
B) 根据句意,用括号中所给单词的正确形式填空,每空一词。
61. We prevented them from _____ (kill) the wild animals.
62. There are many ____(fog) days in London.
63. They were ________ (trap) in the burning hotel.
64. He was quite lucky to stay _____ (live) after the accident.
65. If you still do your homework _____(care), you will lose the exam again.
66. Every year, a large number of _____(tour)come here and visit birds.
67. Nature reserves are used to protect _____ (danger) animals.
68. You need more time to practice _____ (play) the piano.
69. Eddie ____(mop) up the floor from 7:00pm to 7:30pm yesterday.
70. They need some workers _____(build) the tall building.
C) 根据所给中文,完成句子翻译,每空一词。
71. 这车开的太快,撞上了树。
The car ran too fast and _____ _____ a tree.
72. 人们恐惧地相互看着,不知该怎么办。
People looked at each other _____ ____ and didn’t know what to do.
73. 每天农民们给我们提供大量的蔬菜。
Every day farmers _____ lots of vegetables _____ us.
74. 小明出生时重4公斤。
Xiao Ming weighed 4 kilos _____ ______.
75. 消防员使我们镇定下来,因为我们都安全了。
The firemen ____ us ____ as we were all safe.
七. 补全短文。根据短文内容及首字母提示,填写所缺的单词。
Many people like to watch TV. For some, w________(81) TV is one of the most important a_____(82) of the day. TV brings the outside world closer to people’s homes. Some people say the world is now s____ (83) than before because of TV. Perhaps they are right.
What’s h____ (84) in other countries? How do people live in places far a___(85)? Is there a good sports game somewhere? What’s life like in the deepest parts of the sea?
Well, just turn on the TV. Turn it on and watch. You can s____(86) a lot and you can learn a lot. Of course, people can also learn through reading or l______(87) to the radio. But with TV they can learn better and more e___(87). Why? Because they can hear and watch, too.
TV helps to open our e_____(89). TV also helps to open our minds. TV often gives us new i_____(90). We learn newer and better ways of doing things. TV is a wonderful thing. How can we make better use of it.
八、翻译课本上的句子
61.谢谢你同意让我去旅游。
62.可惜的是,大熊猫在野外生存很困难。
63.如果没有人买皮草制的衣服,那么人们就不再会杀害野生动物了。
64.这个自然保护区的面积有210,000公顷。
65.我认为有人能听见我,但是很长时间都没有人来。
九. 书面表达。
Amy想推荐Sandy为最佳歌手奖(Best Singer Award),请根据所给的提示替Amy给Mr. Wu 写一封推荐信。
1. Sandy 13岁 在八年级1班
2. 是校音乐俱乐部成员,擅长唱歌和跳舞
3. 每天练琴1小时
4. 友好乐观,经常组织班级活动
5. 我们大家都喜欢她
Dear Mr. Wu
I would like to
________________________________________________
Yours faithfully
Amy
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寒假作业是寒假内七年级数学教师给学生布置的作业,新学期归来了,你的寒假作业做得怎么样?读文网为大家整理了七年级数学寒假作业的答案,欢迎大家阅读!
7.列方程解应用题──有趣的行程问题 答案
1.1或3 2.4.8 3.640
4.16
提示:设再过x分钟,分针与时针第一次重合,分针每分钟走6°,时针每分钟走0.5°, 则6x=0.5x+90+0.5×5,解得x=16 .
5.C 6.C 提示: 7.16
8.(1)设CE长为x千米,则1.6+1+x+1=2×(3-2×0.5),解得x=0.4(千米)
(2)若步行路线为A→D→C→B→E→A(或A→E→B→C→D→A)则所用时间为: (1.6+1+1.2+0.4+1)+3×0.5=4.1(小时);
若步行路线为A→D→C→E→B→E→A(•或A→E→B→E→C→D→A),
则所用时间为: (1.6+1+0.4+0.4×2+1)+3×0.5=3.9(小时),
因为4.1>4,4>3.9,
所以,步行路线应为A→D→C→E→B→E→A(或A→E→B→E→C→D→A).
9.提示:设此人从家里出发到火车开车的时间为x小时,
由题意得:30(x- )=18(x+ ),解得x=1,
此人打算在火车开车前10分钟到达火车站,
骑摩托车的速度应为: =27(千米/小时)
10.7.5 提示:先求出甲、乙两车速度和为 =20(米/秒)
11.150、200
提示:设第一辆车行驶了(140+x)千米,
则第二辆行驶了(140+x)•× =140+(46 + x)千米,
由题意得:x+(46 + x)=70.
12.66 13.B
14.D 提示:设经过x分钟后时针与分针成直角,则6x- x=180,解得x=32
15.提示:设火车的速度为x米/秒,
由题意得:(x-1)×22=(x-3)×26,解得x=14,•
从而火车的车身长为(14-1)×22=286(米).
16.设回车数是x辆,则发车数是(x+6)辆,
当两车用时相同时,则车站内无车,•
由题意得4(x+6)=6x+2,解得x=11,
故4(x+6)=68.即第一辆出租车开出,最少经过68分钟时,车站不能正点发车
8.列方程解应用题──设元的技巧 答案
1.285713
2.设这个班共有学生x人,在操场踢足球的学生共有a人,1≤a≤6,
由 +a =x,•得x= a, 又3│a,
故a=3,x=28(人).
3.24 4.C 5.B
提示:设切下的每一块合金重x克,10千克、15千克的合金含铜的百分比分别为
a、b(a≠b),
则 ,
整理得(b-a)x=6(b-a),故x=6.
6.B 提示:设用了x立方米煤气,则60×0.8+1.2(x-60)=0.88x.
7.设该产品每件的成本价应降低x元,
则[510×(1-4%)-(400-x)]×(1+10%)m=•(510-400)m 解得x=10.4(元)
8.18、15、14、4、8、10、1、
9.1:4 提示:设原计划购买钢笔x支,圆珠笔y支,圆珠笔的价格为k元,
则(2kx-•ky)×(1+50%)=2ky+kx,解得y=4x.
10.282.6m 提示:设胶片宽为amm,长为xmm,
则体积为0.15axm3,盘上所缠绕的胶片的内、外半径分别为30mm和30+015×600=120(mm),其体积又可表示为 (120-30)•a=13500a(m3),
于是有0.15ax=13500a ,x=90000 ≈282600,胶片长约282600mm,即282.6mm.
11.100 提示:设原工作效率为a,工作总量为b,由 - =20,得 =100.
12.B 13.A
14.C 提示:设商品的进价为a元,标价为b元,
则80%b-a=20%a,解得b= a,•
原标价出售的利润率为 ×100%=50%.
15.(1)(b-na)x+h
(2)由题意得 得a=2b,h=30b.
若6个泄洪闸同时打开,3小时后相对于警戒线的水面高度为(b-na)x+h=-3b<0.•
故该水库能在3个小时内使水位降至警戒线.
16.(1)设这批货物共有T吨,甲车每次运t甲吨,乙车每次运t乙吨,
则2a•t甲=a•t乙=T,•得t甲:t乙=1:2.
(2)由题意得: = , 由(1)知t乙=2t甲,
故 = 解得T=540.
甲车车主应得运费540× ×=20=2160(元),•
乙、•丙车主各得运费540•× ×20=4320(元).
9.线段 答案
1.2a+b 2.12 3.5a+8b+9c+8d+5e 4.D 5.C
6.A 提示:AQ+BC=2250>1996,所以A、P、Q、B四点位置如图所示:
7.MN>AB+NB 提示:MN=MA+AN= AB,AB+NB=AB+(CN-BC)= AB 8.MN=20或40
9.23或1 提示:分点Q在线段AP上与点Q在线段PB上两种情况讨论
10.设AB=x,则其余五条边长度的和为20-x,由 ,得 ≤x<10
11.3 提示:设AC=x,CB=y,则AD=x+ ,AB=x+y,CD= ,CB=y,DB= ,由题意得3x+ y=23.
12.C 提示:作出平面上5点,把握手用连接的线段表示.
13.D 提示:平面内n条直线两两相交,最少有一个交点,最多有 个交点.
14.A 提示:考察每条通道的最大信息量,有3+4+6+6=19.
15.A 提示:停靠点设在A、B、C三区,计算总路程分别为4500米、5000米、•12000米,可排除选项B、C;设停靠点在A、B两区之间且距A区x米,则总路程为
30x+15(100-x)+10(300-x)=4500+5x>4500,又排除选项D.
16.(1)如图①,两条直线因其位置不同,可以分别把平面分成3个或4个区域;•如图②,三条直线因其位置关系的不同,可以分别把平面分成4个、6个和7个区域.
(2)如图③,四条直线最多可以把平面分成11个区域,•此时这四条直线位置关系是两两相交,且无三线共点.
(3)平面上n条直线两两相交,且没有三条直线交于一点,把平面分成an个区域,平面本身就是一个区域,当n=1时,a1=1+1=2;当n=2时,a2=1+1+2=4;当n=3时,a3=1+1+2+•3=7;当n=4时,a4=1+1+2+3+4=11,„
由此可以归纳公式an=1+1+2+3+„+n=1+ = .
17.提示:应建在AC、BC连线的交点处.
18.记河的两岸为L,L′(如图),将直线L平移到L′的位置,则点A平移到A′,•连结A′B 交L′于D,过D作DC⊥L于C,则桥架在CD处就可以了.
10.角 答案
1.45° 2.22.5° 提示:15×6°-135×0.5°
3.15 4.6 5.B 6.A 7.C 8.B
9.∠COD=∠DOE 提示:∠AOB+∠DOE=∠BOC+∠COD=90°
10.(1)下列示意图仅供参考
(2)略
11.345° 提示:因90°<α+β+γ<360°,
故6°< (α+β+γ)<24°,计算正确的是23°,
所以 α+β+γ=23°×15=345°.
12.∠EOF、∠BOD、∠BOC;∠BOF、∠EOC
13.若射线在∠AOB的内部,则∠AOC=8°20′;若射线OC•在∠AOB•的外部,•则∠AOC=15° 14.40° 15.C 16.D
17.20° 提示:本题用方程组解特别简单,
设∠COD=x,∠BOC+∠AOD=y,•由题意得:
18.提示:共有四次时针与分针所夹的角为60°
(1)第一次正好为两点整
(2)第二次设为2点x分时,时针与分针的夹角为60°,则x=10+ +10,解得x=21
(3)第三次设3点y分时,时针与分针的夹角为60°,则y+10= +15,解得y=5
(4)第四次设为3点z分时,时针与分针的夹角为60°,则z=15+ +10,解得z=27
19.提示:若只连续使用模板,则得到的是一个19°的整数倍的角,即用模板连续画出19个19°的角,得到361°的角,•去掉360°的周角,即得1°的角.
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作业本是辅助学生学习的重要途径,接下来是读文网小编为大家带来的8年级上册数学第二章作业本答案,供大家参考。
2.1图形的轴对称作业本2答案
1、①
2、A
3、略
4、8 cm²
5、(1)垂直
(2)AB = 4,BC = 5
(3)略
6、(1)作线段AB,与直线l交于点D,点D就是奶吧所在位置
(2)作点A关于直线l的对称点A',连结A'C,交直线l于点D,点D就是奶吧所在位置
2.2等腰三角形作业本1答案
1、(1)B
(2)4
2、3个;△ABC,△ABD,△ACD;∠ADC;∠DAC,∠C;AD,DC;AC
3、15 cm,15 cm,5 cm
4、由题意得,∠BAD = ∠CAD。由于M,N分别是AB,AC的中点,而AB = AC,所以AM = AN。又因为AD = AD,从而得△AMD ≌ △AND。因此DM = DN
5、(1)略
(2)CF = 1.5 cm
6、∵ AB = AC,BE = CD,
∴ AD = AE
又∵ ∠A = ∠A,
∴ △ABD ≌ △ACE(SAS)。得BD = CE
*7、共有5个点,图中点C1,C2,C3,C4,C5均可
第2章 特殊三角形
2.AB 与CD 平行.量得线段BD 的长约为2cm,所以两电线杆间的距离约为120m
【2.1】3.1?5cm 4.略5.由m∥n,AB⊥n,CD⊥n,知AB=CD,∠ABE=∠CDF=90°.1.B∵ AE∥CF, ∴ ∠AEB=∠CFD. ∴ △AEB≌△CFD,2.3个;△ABC,△ABD,△ACD;∠ADC;∠DAC,∠C;AD,DC;AC∴ AE=C
F3.15cm,15cm,5cm 4.16或176.AB=BC.理 由 如 下:作 AM ⊥l5.如图,答案不唯一,图中点C1,C2,C3均可2于 M,BN ⊥l3于 N,则 △ABM ≌△BCN,得AB=BC6.(1)略 (2)CF=1?5cm7.AP 平分∠BAC.理由如下:由 AP 是中线,得 BP=复习题PC.又AB=AC,AP=AP,得△ABP≌△ACP(SSS).1.50 2.(1)∠4 (2)∠3 (3)∠1 ∴ ∠BAP=∠CAP(第5题)3.(1)∠B,两直线平行,同位角相等
【2.2】(2)∠5,内错角相等,两直线平行(3)∠BCD,CD,同旁内角互补,两直线平行1.(1)70°,70° (2)100°,40° 2.3,90°,50° 3.略4.(1)90° (2)60°4.∠B=40°,∠C=40°,∠BAD=50°,∠CAD=50° 5.40°或70°5.AB∥CD.理由:如图,由∠1+∠3=180°,得6.BD=CE.理由:由AB=AC,得∠ABC=∠ACB.(第又∵∠3=72°=∠25题) ∠BDC=∠CEB=90°,BC=CB,∴ △BDC≌△CEB(AAS). ∴ BD=CE6.由AB∥DF,得∠1=∠D=115°.由BC∥DE,得∠1+∠B=180°.(本题也可用面积法求解)∴ ∠B=65°7.∠A+∠D=180°,∠C+∠D=180°,∠B=∠D
【2.3】8.不正确,画图略1.70°,等腰 2.3 3.70°或40°9.因为∠EBC=∠1=∠2,所以DE∥BC.所以∠AED=∠C=70°4.△BCD 是等腰三角形.理由如下:由BD,CD 分别是∠ABC,∠ACB 的平50 分线,得∠DBC=∠DCB.则DB=DC
【2.4】略
【2.5(1)】5.∠DBE=∠DEB,DE=DB=56.△DBF 和△EFC 都是等腰三角形.理由如下:1.C 2.45°,45°,6 3.5∵ △ADE 和△FDE 重合, ∴ ∠ADE=∠FDE.4.∵ ∠B+∠C=90°, ∴ △ABC 是直角三角形∵ DE∥BC, ∴ ∠ADE=∠B,∠FDE=∠DFB,5.由已知可求得∠C=72°,∠DBC=18°∴ ∠B=∠DFB. ∴ DB=DF,即△DBF 是等腰三角形.6.DE⊥DF,DE=DF.理由如下:由已知可得△CED≌△CFD,同理可知△EFC 是等腰三角形∴ DE=DF.∠ECD=45°, ∴ ∠EDC=45°.同理,∠CDF=45°,7.(1)把120°分成20°和100° (2)把60°分成20°和40°∴ ∠EDF=90°,即DE⊥DF
【2.5(2)】1.(1)3 (2)51.D 2.33° 3.∠A=65°,∠B=25° 4.DE=DF=3m2.△ADE 是等边三角形.理由如下: ∵ △ABC 是等边三角形,∴ ∠A=∠B=∠C=60°. ∵ DE∥BC, ∴ ∠ADE=∠B=60°,5.由BE=12AC,DE=12AC,得BE=DE 6.135m∠AED=∠C=60°,即∠ADE=∠AED=∠A=60°3.略
【2.6(1)】4.(1)AB∥CD.因为∠BAC=∠ACD=60°1.(1)5 (2)12 (3)槡5 2.A=225(2)AC⊥BD.因为AB=AD,∠BAC=∠DAC5.由AP=PQ=AQ,得△APQ 是等边三角形.则∠APQ=60°.而 BP=3.作一个直角边分别为1cm和2cm的直角三角形,其斜边长为槡5cmAP, ∴ ∠B=∠BAP=30°.同理可得∠C=∠QA C=30°.4. 槡2 2cm (或槡8cm) 5.169cm2 6.18米∴ ∠BAC=120°7.S梯形BCC′D′=1(C′D′+BC)2BD′=1(a+b)2,6.△DEF 是等边三角形.理由如下:由 ∠ABE+ ∠FCB= ∠ABC=60°,22∠ABE=∠BCF,得∠FBC+∠BCF=60°. ∴ ∠DFE=60°.同理可S梯形BCC′D′=S△AC′D′+S△ACC′+S△ABC=ab+12c2.得∠EDF=60°, ∴ △DEF 是等边三角形由1(a+b)2=ab+17.解答不唯一,如图22c2,得a2+b2=c2
【2.6(2)】1.(1)不能 (2)能 2.是直角三角形,因为满足m2=p2+n2 3.符合4.∠BAC,∠ADB,∠ADC 都是直角(第7题)5.连结BD,则∠ADB=45°,BD= 槡32. ∴ BD2+CD2=BC2,∴ ∠BDC=90°. ∴ ∠ADC=135°
第二单元作业本答案
9, 如图,在ABC中, ∠C=29°D为AC上一点,且AB=AD,DB=DC,求∠A的度数。10, 如图,点D,E在△ABC的边BC上,若AD=AE,BD=CE,则AB=AC。请说明理由、。13, 如图, 已知AB=AC,∠B=∠C,则BD=CD 。请说明理由。15, 如图, AC,BD交于点O。已知∠A=∠C=90°, AC=BD。试说明OB=OC。
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作业本的答案有哪些呢?接下来是读文网小编为大家带来的8年级上册数学第一章作业本答案,供大家参考。
1.1认识三角形(1)作业本1答案
1、(1)△ABD,△ADC,△ABC
(2)∠B,∠BAD,∠ADB;AB,AD,BD
(3)85,55
2、(1) <
(2) >
3、(1)2
(2)3
(3)1
4、(1)能
(2)不能
(3)不能
(4)能
5、有两种不同选法:4 cm,9 cm,10 cm;5 cm,9 cm,10 cm
*6、有两种不同的摆法,各边的火柴棒根数分别为2,4,4;3,3,4
1.1认识三角形(2)作业本2答案
1、ABC,25,3,6
2、⊥,⊥
3、略
4、∠ABD = 30°,∠CBD = 40°
5、(1)130°
(2)130°
(3)(90 + 1/2x)度
6、AB = 5 cm
1.2定义与命题(1)作业本1答案
1、C
2、C
3、(1)如果两直线平行,那么内错角相等
(2)如果一个数是无限小数,那么它是个无理数
4、(1)(2)(3)(4)(5)(8)是命题;(6)(7)不是命题
5、答案不唯一,如:如果两条直线平行,那么同位角相等;如果a > b,b > c,那么a > c
6、三角形中有两条边相等(或有两个角相等),有两条边相等(或有两个角相等)的三角形叫做等腰三角形
1.2定义与命题(2)作业本2答案
1、C
2、(1)定理
(2)定义
3、A
4、(1)真命题。分成的两个三角形等底同高
(2)假命题。如a = 130°,β = 20°,则a - β = 110° > 90°
(3)真命题。∠1的对顶角与∠2相等,根据同位角相等,两直线平行可以判定a∥b
5、由∠FAB = ∠ABC + ∠ACB,得∠ACB = 35°,
由AB∥CD,得∠BCD = ∠ABC = 35°,
因此∠ACB = ∠BCD,所以CE平分∠ACD
6、(1)答案不唯一,例如,垂直于同一条直线的;平行于同一条直线的;不相交的
(2)90
(3) <
1.3证明(1)作业本1答案
1、已知;两直线平行,内错角相等;已知;AED,2;内错角相等,两直线平行
2、由∠ACB = 90°,得∠A + ∠B = 90°.
由CD ⊥ AB,得∠B + ∠DCB = 90°,从而∠A = ∠DCB
3、由已知得½(∠EFC + ∠AEF) = 90°,即∠EFC + ∠AEF = 180°,得AB∥CD
4、由DE∥BC,得∠CDE = ∠DCB。由FG∥CD,得∠DCB = ∠BGF
∴ ∠CDE = ∠BGF
5、是真命题,设原两位数表示为10x + y,则新两位数表示为10y + x.
(10y + x)(10x + y) = 9y - 9x = 9(y - x)
1.3证明(2)作业本2答案
1、45°
2、∠a = ∠PBA = 40°
3、(1)>
(2)∠ADB > ∠DCB > ∠CDE,所以∠ADB > ∠CDE
4、由∠EAC = ∠B + ∠C,得∠C = ½∠EAC = ∠DAC, ∴ AD∥BC
5、已知:直线AB,CD被直线EF所截,AB∥CD,EG平分∠BEF,FH平分∠EFC.
求证:EG∥FH。 证明:略
6、答案不唯一。例如:
方法一:连结BD,证△ABD ≌ △CDB;
方法二:延长BC至E,证∠DCE = ∠B = ∠D
1.4全等三角形作业本1答案
1、图②与图④,图③与图⑤分别全等
2、(1)×(2)√
3、对应边是BC和EF,AB和DE,AC和DF;
对应角是∠ABC和∠DEF,∠ACB和∠DFE、∠BAC和∠EDF
4、(1)CD,CB
(2)∠S,∠SRO
5、(1)CD = BD = 4,AC = AB = 5
(2)∠B - ∠C = 30°,∠ADB = ∠ADC = 100°,∠BAD = 50°
1.5三角形全等的判定(1)作业本2答案
1、略
2、略
3、AC,已知,AD,SSS
4、稳定性
5、CF,EF,DE,已知,△DEF,∠E
6、可增加条件AC = DB,理由略
*7、(1)运用SSS判定△OCE与△ODE全等,则有∠COE = ∠DOE
(2)画图略
1.5三角形全等的判定(2)作业本1答案
1、∠ABC = ∠EBD或∠ABE = ∠CBD
2、3,线段垂直平分线上的点到线段两端点的距离相等
3、∠CBD,已知,公共边,△ABD,△CDB,SAS
4、周长为6
5、(1)△AED ≌ △ACD(SAS)
(2)由DC = DE = 2 cm,得BC = BD + DC = 5 cm
6、方法1:BO是线段AC的垂直平分线,所以BA = BC;
方法2:△AOB ≌ △COB(SAS),所以BA = BC
1.5三角形全等的判定(3)作业本2答案
1、C,已知,AC,已知,A,公共角,ASA
2、①②③
3、∠B = ∠D,DF = BE,△ABF ≌ △CDE等
4、依据“ASA”
5、由△AOE ≌ △DOF(ASA),得EO = FO,从而O是EF的中点
6、由∠1 = ∠2,得∠DAC = ∠EAB。判定△ACD ≌ △ABE(ASA),得AE = AD
1.5三角形全等的判定(4)作业本1答案
1、2
2、∠CAD,CAD,C,AAS
3、由∠A = ∠D,∠AOC = ∠DOB,CO = BO,得△AOC ≌ △DOB(AAS),得AO = DO
4、(1)AC = BD
(2)∠A = ∠D
(3)∠ABC = ∠DCB,或∠ABD = ∠DCA
5、(1)∠C = ∠DEB = ∠DEA,∠A = ∠ABD = ∠CBD,∠ABC = ∠CDB = ∠EDB = ∠ADE(写出其中任意3对即可)
(2)AE = BE = BC,CD = ED,AD = BD
(3)△AED ≌ △BED,△BED ≌ △BCD,△AED ≌ △BCD
6、画三角形任意两个内角的平分线,其交点即为度假村的位置
第一章复习题作业本1答案
1、80
2、C
3、B
4、9
5、答案不唯一,例如,AB = AC,或∠B = ∠C,或∠AEB = ∠ADC等
6、(1)在同一平面内,如果两条直线重直于同一条直线,那么这两条直线平行
(2)如果一个数既能被2整除,又能被3整除,那么这个数必定能被6整除
7、略
8、由△ABF ≌ △DCE(AAS),得AB = DC
9、3
10、3
11、1
12、(1)由AC = BC,∠ACD = ∠BCE = 120°,CE = CD,得△ACD ≌ △BCE(SAS)
(2)证△BCM ≌ △ACN(ASA),得CM = CN
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初二课程逐渐增多,难度增加,习题视为了巩固同学们对知识点的掌握,下面是读文网小编带来的关于2016苏科版八年级上册数学补充习题答案的内容,希望会给大家带来帮助!
第1页—第3页
1. 选择题
1A 2D 3A 4C
2. 填空
(1)T=20-6h 20,6 T h h
(2)Q=6x105-pt 6x105 p Q t 0≤t≤6x105/p
(3)S=1.5b (4) 0≤x≤7 0≤y≤5 5 0
3.解答题
(1)y= Q/a-x –Q/a (0≤x≤a)
(2)y=80-2x
20(3) ①-2≤x≤3
②当x=3,y有最小值为1/2
③当-2≤x≤0,y随x的增大而增大,当0≤x≤3,y随x的增大而减小
(4)①`v=800-50t
②0≤t≤16
③当t=8时 , v=800-50x8=400
④当v=100时,100=800-50t
T=14
第5页—第7页
选择题
1B 2C 3C 4B 5B 6A 7B 8D
填空
(1)1 (2)y=2x+1 -1 (3)m<2 n<3 (4)y=-3x+3
(5)y=x+3 (6)y=64x+48 (7)S=2n+1 (8)y=1/5 x-6 30
解答题
(1) 设y=kx+b
-4k+b=15
6k+b= -5
k= -2 b=7
y= -2x+7
(2)略
(3)①表示y与x的关系,x为自变量
②10时离家10km 13时离家30km
③12时-13时,离家30km
④13km
⑤2时-13时
⑥15km/h
第9页—第11页
1. 选择题
(1)A (2)C (3)C
2.填空
(1)y=-2x (2)m<2 (3)y=5x+3 (4)y2>y1 (5)y=-2x+100 25(6)9
3.解答题
(1) ① Q=200+20t② (0≤t≤30)
(2) ①y=80 (0≤x≤50)
y=1.9x-15 (50≤x≤100)
②y=1.6x
③选择方式一
(3)①在同一直线上 y=25/72x
②当x=72时,y=25
当x=144时,y=50
当x=216时,y=75
y=25/72 x (0≤x≤345.6)
③当x=158.4时,y=25/72x158.4=55
(4) ①y甲=2x+180
y乙=2.5x+140
②当x=100时,y甲=200+180=380
Y乙=140+250=390
380〈390
租甲车更活算
第13页—第15页
1.选择题
(1)D (2)C (3)C
2.填空
(1)x=2
y=3
(2)x=2 x>2
(3)-3 -2 x= -5/8 y= -1/8
(4)1/2 0 x=2
y=3
(5)y=5/4 x
2. 解答题
3. (1)略
(2)①依题意
-k+b= -5
2k+b=1
解得
k=2 b= -3
y=2x+3
当y≥0 时
2x-3≥0, x≥3/2
②当x<2时,2x<4
则2x-3<1
即y<1
(3) ①y会员卡=0.35+15
y租书卡=0.5x
②若y会员卡〈y租书卡
则0.35x+15<0.5x
x>100
租书超过100天,会员卡比租书卡更合算
(4)设A(m,n)
1/2x4xm=6
m=3
n=2
A ( -3, -2)
y=2/3x , y= -2/3x -4
(5) ① y甲=0.8x1.5X+900=1.2x+900 (x≥500)
Y乙=1.5x+900x0.6=1.5x+540 (x≥500)
②若y 甲=y乙
1.2x+900=1.5x+540
x=1200
当x<1200时,选择乙厂
当x=1200时,两厂收费一样
当x〉1200时,选择甲厂
2000>1200,选择甲厂
y甲=1.2x2000+900
0=3300
第17页—第19页
1.选择题
(1)C (2)D (3)C
2.填空
(1) 630 (2)0.17 0.17 (3)35 (4) ① 238.18 24 ②12.9 ③2万
3解答题
(1)
①七大洲 亚洲
②亚洲和非洲
③100%
④大洋洲
⑤不能
(2)① 一车间 第四季度
②一车间 二车间
③ ①是图(1)得出的 ②是图(2)得出的
(3)①48 ②0.25 ③哪一个分数段的学生最多? 70.5~80.5的学生最多。
第21页—第23页
1.选择题
(1)B (2)B (3)C (4)B
2.填空
(1)20% 30% 25% 25% (2)扁形 36% 115.2度 (3)411
3解答题
(1)
县 A B C D E F
人口(万) 90 15 72 273 77 71
百分比 12.9% 2.1% 10.3% 39.1% 11.0% 24.5%
圆心角度数 46.4 7.7 37.1 140.8 39.7 88.2
(2) 图略
(3)身高(cm) 频数
154.5~159.5 2
159.5~164.5 4
164.5~169.5 6
169.5~174.5 10
174.5~179.5 5
179.5~184.5 3
(4)图略 结论:只有少数人对自己工作不满。
5)① 20 0.16 ②略
第25页—第27页
1.选择题
(1)B (2)C (3)A(4)C (5)B (6)C
2.填空
(1)∠D ∠C DC OD OC (2)D E C DE ∠D 600
(3) ∠CAD CD (4) 500 10 10 8 (5) ADE CAE
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寒假作业特指寒假内教师给学生布置的作业。下面是读文网小编网络整理的五年级寒假作业数学答案2016以供大家学习。
以上就是小编整理的五年级寒假作业数学答案2016的全部内容,更多内容关注读文网网学习方法频道!
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对于英语寒假作业的练习,会让你收获新的知识。下面是读文网小编网络整理的七年级上册英语寒假作业答案人教版2016以供大家学习。
(一)
一 helicopter abacus ferry ambulance handcuffs purse cycling trainer astronaut
二 one hundred and fifty-eight
two thousand and one
fourty-five percent
zero point twenty-five
six point zero three
sixty degree
six point fifty-nine
one thousand five hundred and seventy-one
one/sixth
three/fifth
(二)
一 play football wash his face play the violin make phone calls to sb. arguing fishing
二 (1)1,000、120、852 (2)15、79、17、27、2,005 (3) 3/10、3/5、3/7、7/9 (4) 50%、75% (5)25°、160°
(5)0.78、11.45、21.13、57.22、6.5
(三)
(1)Sun is the only star in our salar system.
(2) It gives us heat and light.
(3) The moon is just 380,000 kilometers away.
(4) It looks much smaller because it is very for away.
(5) It takes four years for light to reach us from Alpha Centauri.
(四)
was/were cooked knew swam got taught leaved felt smelt drove ran thought kept bought began did
cost found throught stood spake came gave heard sold hurt saw steal took slept sit met brought flew
woke chose lost read rose wore
(五)
(1) Wat's your favourite sports?
(2) A man steal a purse from a tourist.
(3) They did cought the thief.
(4) Our class consist of 40 students.
(5) I aim the torch at his eye.
(六)
1、 I attend school everyday. I attended church yesterday.
I will be attending a concert tomorrow.
I have to explain why I am late everyday.
I explained the question to her two days ago.
I will be explaining the details next week.
The thief steals everyday.
He stole the wallet last Sunday.
They will be stealing the painting tomorrow.
She likes to invite people to her house everday.
She invited me to her party yesterday.
She invited me to her party yesterday.
She will be inviting me to her party tomorrow.
2、 $75 $60 $15
(七)
1、The boy went to the recepttion.
2、The boy is at the recepttion .
3 The boy is far from the recepttion.
4、The cat jumped onto the table.
5、The cat on the table
6、The cat fall off the table.
7、It is above the car.
8、It is below the car.
9、The boy is in front of the car.
10、The boy is behind the car.
11、The policeman is behind two cars.
12、The boy walks into the house.
13、The girl is in the house.
14、 The boy walks out of the house . The most important qualities:helpful,friendly,kind Reasons:I think make friends should care about each other,help each other. Feb 1: to clean up the house and prepare for reunion dinner; Feb 1 till mid night: to dine till 2359 hours for the new year; Feb 2: get lucky money Feb 2: to pay our senior member of the family visit and wish them a very prosperous new year; Feb 3: To visit our relatives and friend for new year;
(八)
走进大门的右侧是问讯处(formation desk)。鹦鹉馆紧挨着问讯处。如果需要饮料或想吃点东西,小吃部(cafeteria)就在鹦鹉馆的后面,所以有些嘈杂。狮虎山与鹦鹉馆相对,狮子在前,老虎在后。斑马在进大门左侧的第一个房子里。大象房正对着大门,而猴山则在挨着大象房的左角侧。袋鼠馆则在鹦鹉馆过去,紧挨着大象房的右角侧。最后,熊山在左侧的狮虎山和猴山之间。
(九)
I always take a shower. I do the homework very often I often play football sometimes I watch the TV I never go shopping I don't often go to bed early o sometimes I go to bed early 1/The largest mammals in the world. 2/weight 3/White Rhinoceeros 4/100 feet long 5/8000 pounds 6/White Rhinoceeros In new year,my family want to travel,but every one have different ideas. so i look for many books,and i want go to beijin,because i think there is our capital city,i like the Great Wall and the imperial palace.and some food tastes delicious every year,a lot of visitors come to there. I think we have a good travel. P41 helicopter abacus ferry ambulance handcuffs purse cycling trainer astronaut one hundred and fifty eight two thousand and one 45 percent zero point two five six piont zero three sixty centigrade six pointi five nine one thouusand five hundred and seventy one one sixth threee fifth P48 what's your favorite sports? A man steal from a tourist a purse They did catch the thief Our class consist of 40 students l aim the torch at his eye .
(十)
1、I attend school everyday. I attended church yesterday. I will be attending a concert tomorrow. I have to explain why I am late everyday. I explained the question to her two days ago. I will be explaining the details next week. The thief steals everyday. He stole the wallet last Sunday. They will be stealing the painting tomorrow. She likes to invite people to her house everday. She invited me to her party yesterday. She will be inviting me to her party tomorrow.
2、 75美元 60美元 15/75
以上就是小编分享的七年级上册英语寒假作业答案人教版2016全部内容,相信这些对你会有用的。
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在寒假里,我们要做好每一个作业。下面是读文网小编收集整理的2016六年级数学寒假作业答案以供大家学习。
2016六年级数学寒假作业答案
以上就是读文网小编收集的2016六年级数学寒假作业答案全部内容,希望对你有帮助。
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做好寒假作业对于学生来说有着重要的意义。下面是读文网小编为大家收集整理的五年级数学寒假作业答案,相信这些文字对你会有所帮助的。
一、比一比,再组词。(7分)
恰 ( ) 哺( ) 析( )潜( )链( )赖( )劈( )
洽 ( ) 捕( ) 折( )替( )涟( )懒( )壁( )
二、我会判断。(6分)
1、判断下列每组的注音,全对的一组是( )。
A、尺蠖(huò) 羚(ling)羊 上 腭(è)
B、潜(qiǎn)行 卵(luǎn)生 迁qiān就
C、焕(huàn)发 烟囱(chōng) 喧嚣(xiāo)
2、下面的说法,正确的是( )。
A、“遵”的第十四笔是横折折撇。
B、“肺”的右边是“市”字。
C、“基”和“囱”都是独体字,起笔都是撇。
3、选词填空,恰当的一组是( )。(2分)
(1)甲虫吃草,蜘蛛吃甲虫,山雀吃蜘蛛,鹰又 山雀。
(2)一只甲虫,地上一平方米的 空间便可满足它的营养需要。
(3)鹰需要在几十平方公里的范围内 ,才能得到足够的食物。
A、采食 觅食 捕食 B、捕食 采食 觅食 C、捕食 觅食 采食
三、我会分类。(6分)
蝗虫 田鼠 黄鼠狼 兔子 蜘蛛 狮子 虎
甲虫 羚羊 尺蠖 狐狸 鹿 菜蚜 狼
( )类:
( )类:
( )类:
四、说明方法我知道。(3分)
A、 下定义 B、作比较 C、列数字 D、打比方 E、举例子
1、这些生物中,甲虫比草虫少,山雀比蜘蛛少,鹰比山雀少。( )
2、在冬季,白鳍豚的脂肪层厚达五六厘米,占体重的三分之一以上。( )
3、科学家考察了生物世界的食物链,发现它恰似一座金字塔,便把这叫做生态金字塔。( )
4、密密层层的枝叶如同张挂在舞台上的吸音帷幕,能把大部分噪音吸收掉。( )
5、白鳍豚的肺容量很大,它头顶露出水面,通过鼻孔吸足一口气,就能在水中潜行半个小时左右。( )
6、鲸是很大的动物,我国曾捕获一头4万公斤的鲸。( )
五、按要求改写句子,不改变句子意思。(10分)
1、谁不夸咱班长好?
改为陈述句:____________________________________ ___
2、妈妈对小明说:“我今天值夜班,你自己烧饭吃。”
改为转述句:_______________________________________
3、王刚对爷爷说:“死老头,我要洗澡了,还不快点给我提水去。”
改为礼貌用语:___________________________________ ___ _
4、虽然天气变化,但是这架飞机不能按时起飞。
修改病句:
5、陆地这么大。 陆地还占不到地球总面积的三分之一。
用关联词将两句合成一句:
六、阅读练习。
阅读(一)
生态金字塔告诉人们,大自然的承载能力是有限的,绝不可能超过去供养金字塔顶端的消费者。人类的活动必须遵循这个自然法则,否则,将使人类自己遭到大自然的惩罚。
1、请你说说“这个自然法则”是什么法则?(2分)
2、这一段话讲了几层意思?把每一层的意思写下来。(2分)
3、写一句保护生态环境的宣传标语,或为保护环境写一句公益广告词。(2分)
阅读(二)
水是宝贵的自然资源,是地球上一切生物赖以生存的物质之一。地球总水量约为14.1亿立方公里,但如此多的水中淡水只占3%,而且其中的87%被封闭在冰川、大气、地层中。20世纪以来,全球人口增长了3倍,经济增长了20倍,用水量增长了10倍。同时,由于生产和生活废水急增,而且不经处理直接排入水体,更加重了水资源匮乏这一全球性危机。
联合国教科文组织在97年把水资源定义为“可资利用或可能被利用的水源,即应当能够为满足生产生活用途而得以利用”,而《中国自然资源》将水资源定义为“能为人类生产生活直接利用的,在水循环过程中产生的地表、地下径流和由它们存留在陆地上可再生的水体”。
我国水资源总量约2.8万亿立方米,但人均占有量只排在世界第121位,是世界人均占有量的1/4。此外,我国水资源空间分布很不均匀,南多而北少。重经济发展而轻环境保护又导致许多地区出现严重的水体污染,因此,水资源问题也成了我国社会和经济发展中的重大问题。
1、请简要列出全球水资源危机产生的若干原因。 (2分)
答:_______________________________ ___ _
2、文中对“水资源”有两种定义,请指出它们的主要相同点和不同点。(2分)
答:(1)相同点:______________________________________________________
(2)不同点:_____________________________________________________
3、请概括出目前我国水资源的三个特点; (3分)
(1)_________________________________(2)______________________ ___
(3)______________________
4、简要说说本文给你的启示。(2分)
一、找出每组词语中加点字读音不相同的一项,将序号填在括号里。(4分)
1.A打量 B重量 C力量 D不自量力 ( )
2.A禁受 B禁止 C不禁 D情不自禁 ( )
3.A直奔 B奔跑 C投奔 D奔命 ( )
4.A哽咽 B吞咽 C咽下 D狼吞虎咽( )
二、下面书写全部正确的一组是( )(1分)
A、鱼钓 疑聚 疤痕 郑重其事 B、蒙胧 幽香 弥漫 跳入眼帘
C、辅导 温馨 锻炼 朦朦细雨 D、歧视 躲避 嘲笑 声名鹊起
三、按要求把下列词语补充完整(7分)
1、在横线上填叠词。(3分)
轻轻 袅袅 散散
胧胧 蔫蔫 平平
2、在括号里填叠词。(3分)
( )的灯光 ( )的笑声 ( )地流淌
( )地念叨 ( )地躺着 ( )地探进
3、在括号里填上反义词。(1分)
有( )有( ) 有( )有( )
四、读句子,用一个意思相近的词语替换句子中加点的词语。(2分)
1、你是爱与美的珍品,让我们无比喜悦。( )
2、望着爸爸枯槁的脸和布满血丝的眼睛,我不禁心疼极了。( )
3、我失落地搁下听筒。( )
4、爹,你就别在我上课前扫街了,人家知道了。会讥笑我的……( )
5、这年的冬天,我的成绩首屈一指。( )
五、下列句子形式改变后,意思不同的一组是( )(3分)
A①没有谁不被英雄事迹所感动。B①这个道理容易明白。C①这件事你得告诉他。
②有谁被英雄的事迹所感动? ②这个道理不难明白。 ②这件事你非得告诉他不可。
六、请用四种不同的句式表示下列句子的意思。(4分)
清早,父亲扫干净了大街。
________________________________ ________________________________
________________________________ ________________________________
七、下列几句话是比喻句的一组是( )(2分)
A.你静静地躺在小床上,像草叶上的露珠一样轻柔。
B.妈妈只是在一旁伏案备课,像是忘记了我的存在。
C.我觉得心跳得特别厉害,脑子里像有一个小小的屏幕,迅速地闪现着一个个镜头。
D.同学们的家长都来了,只有我像个没有爹娘的孩子。
八、读一读,注意破折的用法。选择正确说明的序号填在括号里。(3分)
破折号的用法有:①解释说明②意义的转折③声音的延续
1父亲也在县城里找到了一份工作——扫大街。()
2但其中大多数人是陪人——那些一心企望自己的孩子能上电视屏幕的家长。()
3“yīng——”我夸张地读着。()
八、语言实践:巧用名言警句。(4分)
1、当你的同学不珍惜时间时,你想送给他哪句名言?
__________________________________________________________
2、当你的爸爸妈妈发生争执时,你想送给他们哪句名言?
__________________________________________________________
3、“社会是发展的,人们回青出于蓝而胜于蓝的。”正对应哪句名言?
__________________________________________________________
4、“接近美好的事物会优先得到好的回报和好的享受。”正对应了哪句名言?
__________________________________________________________
5、古往今来的无数人们,都已流水般地相次逝去,面对着空中同一个永恒的明月,或许都曾有过相似的感慨,你会想起哪句名言?
__________________________________________________________
十、课内阅读:
我无心听老师和家长的谈话,随意将目光投向窗外。天哪!父亲,我那扫大街的父亲正站在教室外面,纹丝不动地听着老师和家长们的谈话,他的黑棉袄上满是积雪。
我的眼泪哗哗地流了下来 我冲出教室 将父亲拉进来 对老师说 这是我爹 掌声又一次响了起来
回去的路上,父亲说“你们学校真好,老师同学真好!”
1、给短文中,没有加标点的地方加标点。(4分)
2、“掌声又一次响了起来……”你认为是为谁鼓的掌?为什么?(2分)
3、父亲为什么说:“你们学校真好,老师同学真好!”(2分)
__________________________________________________________
九、我是阅读小能手。
(一)课内阅读。
五位战士胜利地完成了(掩护 保护)任务,准备转移。面前有两条路 一条通往主力(转移 迁移)的方向 走这条路可以很快追上连队 可是敌人紧跟在后 另一条是通向狼牙山的顶峰棋盘陀 那儿三面都是xuán( )yá( )绝壁 走那条路呢?为了不让敌人(发觉 发现)群众和连队主力,班长马宝玉zhǎn( )钉jié( )铁地说了一声“走”,带头向棋盘陀走去。战士们热血沸腾,紧跟在班长后面。他们知道班长要把日寇引上绝路。
1、划去括号中不恰当的词语。(3分)
2、给文中的拼音写上恰当的字。(2分)
3、给文中缺标点的地方加上标点。(3分)
4、这段话主要是讲 。(2分)
5、文中的一个“走”字,体现了班长 ,表现了 。这里,没有写其他战士的语言,只写了他们的心理状态( )和动作( ),行动一致就是最有力的证明。(3分)
七、我会归类。(5分)
喜出望外 心如刀割 痛心疾首 欢天喜地 手舞足蹈
撕心裂肺 喜笑颜开 痛不欲生 兴高采烈 悲痛欲绝
表示高兴、快乐的词语:
表示悲伤、忧郁的词语:
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