范文一:八年级下册学海风暴
《学海风暴》课外拓展提高二十四 参考答案及解析
1.D 2.B 【解析】由于线边上的中线为2则斜边为4.设一直角边例AB为x则另一直角边例BC为y。由题意得∵在△ABC中根据勾股定理xy平方26①x平方y平方16②.由①得x平方2xyy平方26.∵x平方y平方
16。∴2xy10解得xy5.∵S△ABC1/2xy。∴S△ABC5/2.
3.A 4.D 【解析】∵△ABCD是矩形∴ADBC。∵EFBF3∴EC8.∴EC5.∴在△EFC中根据勾股定理得FC4.设AFx则在△ADC中8平方x平方x4平方。解得AF5cm
5.A 6.4或12 7.2 8.75° 【解析】∵AE平分∠BAD∴∠BAE∠EAD45° 又知∠EAO15°∴∠OAB60° ∵
OAOB∴△BOA为等边三角形∴BABO ∵∠BAE45°∠ABC90° ∴△BAE为等腰直角三角形 ∴BABE ∴BEBO∠EBO30°∠BOE∠BEO 此时∠BOE75°故答案为75° 9.4或【解析】解如图一所示 AB是矩形较短边时 ∵矩形ABCD ∴OAODBD ∵OEED13 ∴可设OExED3x则OD2x ∵AE⊥BDAE ∴在Rt△OEA中x平方平方2x平方 ∴x1 ∴BD4 当AB是矩形较长边时如图二所示 ∵OEED13 ∴设OEx则ED3x ∵OAOD ∴OA4x 在Rt△AOE中x平方平方4x平方 ∴x ∴BD8×8× 故答案为4或 10.20cm或22cm。 11.解如图所示连接BE。∵四边形ABCD是矩形∴∠
A90°。∵O为AC中点EO⊥BD∴在△EOB和△EOD中EOEO∠EOB∠EODBOOD。∴△EOB≌△
EODSAS。设AEx则EDEB4-x.∵在Rt三角形ABE中根据勾股定理EB平方AE平方AB平方.即4-x平方x平方3平方.解得x.∴AE. 12.解:1证明:∵四边形ABCD是矩形. ∴DC//AB.∴∠DCA∠CAB. 又∵∠CAB∠EDC ∴AC//DE 2∵在△DEC和△AFB中:∠CAB∠EDC∠DEC∠AFBABDC. ∴ △DEC≌△AFBAAS ∴ECFB∠ECD∠FBA。 ∴EC//FB ∴四边形ABCD为平行四边形。
范文二:八年级下册英语学海风暴UNIT1答案
听力材料及答案
语法专练
一,1,staying 2,reading3,making4.Being5.piaying
二,1.-5BDBDD
三,1.listening to tapes 2,by me 3.by the window 4.by six o’clock 5.Reading more books Section A(1a-2d)
课内基础闯关
一(Driving 2 to improve 3.to make/made 4.reading 5.learning 二,1-5DBBCC
三(1.word by word 2Reading aloud 3.learned a lot 4.too ;to 5.The earlier;the more easily
课外拓展提高
一(1.textbooks 2.aloud 3.pronunciation 4.conversations 5.patient 二(1-5AADBC
三(1-5CDBBC6-10ACAAB11-15.CDDBD
Section A(3a-4c)
课内基础闯关
一.1,grammar 2repeat 3.expressions 4.improve 5.discovered 二(1-5DCCBD
三(1.memorize;talking notes 2.so;that 3.anything special 4.beacuse of 5.fell in love with
课外拓展提高
一.1.ask;for 2.was afraid to 3.look;up 4.take notes 5.Beacuse of 二(1-5CBCDB
三(1-5.CADDD
Section B(1a-1e)
课内基础闯关
一.1.pronounce 2.writing 3.mistakes 4understood 5.make 二(1-5BBDBC
三(1.how to answer 2.lots of challenges 3.make mistakes 4.forgets to do 5.to get the
pronunciation
课外拓展提高
一.1.mistakes 2.partner 3.increase 4.spoken 5.pronounce 二(1-5.ACBAC
三(1.best 2.when 3.in 4.difficult 5.something 6.If 7.say 8.seeing 9.well 10.all
Section B(2a-2e)
课内基础闯关
一.1.wisely 2.reviewing 3.learner 4.interested 5.successful 二(1-5DDCCD
三(1.depend on 2.pay attention to 3.agree with 4.thinking about 5.successful;succeed
课外拓展提高
一.1.attention 2.connect 3.overnight 4.create 5increased 二(1-5BBDBB
三(1-5BDCCA
Section B(3a-Self Check)
课内基础闯关
一.1.remember 2.preparing 3.brain 4.matter 5.information
二.1-5CCCAB
三(1.looking for2.at once 3.stressed out 4.remember calling 5.Keep reading 课外拓展提高
一.1.connect;with 2.pay attention to 3.be afraid to 4.learnt/learned to 5.taking notes 二(1-5CBBAA
三(1-5DAEBG
中考真题点播
1-5ACCBD 6-10ACDBD
Unit 2
范文三:英语八年级上册学海风暴答案
英语八年级上册学海风暴答案
Unit1
1
—
5
CACAA
6
—
10
ACBAB
11
—
20
BCBCCABCBB 21.report 22.the
because 23.went shopping 24.stayed at
home
25.boring
26
—
40
BAACCADBBADBBAC 41
—
55
DFJBEHCGIAEDBGC 56
—
65
DDCCBBCBBD
66.went
67.was
68.spent
69.visited
70.ate
71.delicious 72.shopping 73.cheap 74.friendly 75.fun
76
—
90 CBDBCCBACBDFGAC
作文:略(打字太麻烦了) Unit2
1
—
20
BCBBBCABCAACBCBCCACB
21.pians
22.once
23.on
weekends
24.twice
25.stays
up
26
—
40
ABCBBCDBCACCBBB
41
—
55
EHAJBDFGICDFABE
56
—
65
BBCDCBDBDA 66.but
67.Although 68.good
69.exercise 70.about
71.Third
72.sleep
73.helps
74.get 75.think
76
—
90 CACCBAADCBDABGF
作文:略
范文四:【学海风暴】2015-2016学年八年级英语下册 Unit 7 What’s the highest mountain in the world练习3
Unit 7 What’s the highest mountain in the world
基础导练
Ⅰ. write down the
and of the following adjectives.
Ⅱ . Fill in the blanks with the given words or phrases, using their proper form.
1. China is a lot _____(crowded) than Canada.
2. An adult elephant weighs many _____(time) more than a baby elephant.
3. According to a survey, the noise will prevent the baby rabbits from _____(grow) normally.
4. The old man stopped _____(write) music last year.
5. The police give us so much _____(protect).
6. The Caspian Sea is 1,025 meters deep, and it is the _____( deep) of all the salt lakes.
7. Even more serious difficulties include freezing weather _____(condition) and heavy storms.
8. I like Chinese food better than _____(Japan) food.
9. The baby pandas often die from _____(ill) and do not live very long.
10. Scientists say there are now fewer than 2,000 pandas living in the _____(remain) forests.
能力提升
Ⅲ . Complete the following sentences.
1. 停止向海洋倒垃圾。
Stop _____ rubbish _____ the sea.
2. 鲸鱼的一些身体部位被出售用来制作蜡烛和肥皂等东西。
Whales parts was _____ _____ make things _____ candles and soap.
3. 因为人们为了得到肉、脂肪和食用油而捕杀鲸鱼 , 一些种类的鲸鱼正处在危险中。 Some kinds of whales are _____ _____ because humans catch whales _____ meat, fat and oil.
4. 我们应该保护鲸鱼免受水污染。
We should _____ whales _____ water pollution.
5. 老虎比人强壮得多。
A tiger is _____ _____ than a man.
6. It rained heavily. We wouldn’ t get to school on time.(改为同义句 )
The heavy rain _____ us _____ getting to school on time.
7. Yangtze River is about 6300 kilometers long.(对划线部分提问 )
_____ _____ is Yangtze River?
8. He used to be a history teacher.(否定句 )
He _____ _____ _____ _____ a history teacher.=
He _____ _____ _____ _____ a history teacher.
9. This hill is 1,545 meters high. That hill is 1,545 meters high too.(合并两个 句子)
This hill is _____ _____ _____ that one.
10. He has been at junior high school for 2 years.(对划线部分提问 )
_____ _____ has he been at junior high school?
Ⅳ . Choose the best answer from the given choices.
1. — Did you know China is one of the oldest countries in the world?
— Yes, I did. It’ s ___than the US.
A. much older B. more older C. much elder D. more elder
2. — Which is ___, Town Cinema, Screen City or Movie Palace?
— Movie Palace.
A. popular B. more popular
C. the most popular D. much more popular
3. You are ___ now, Victor. So you should wash your clothes by yourself.
A. enough young B. young enough C. enough old D. old enough
4. Yao Ming is one of ___ most popular ___ in China.
A. a; players B. the; players C. an; runners D. much; runners
5. — How far is it from school?
— About ___.
A. 5 minutes on feet B. 5 minutes walk
C. 5 minutes’ walk D. 5 minutes-walk
6. Shanghai is ___ the east of China and Japan is ___ the east of China.
A.in; in B.to; to C.to; in D.in; to
7. — How does your father go to work?
— On foot. Our house ___ his office.
A. is different from B. is close to
C. is far from D. is the same as
8. — ___ do you think is the best performer?
— Mary. Of course.
A. Who B. When C. What D. Why
9. There isn’ t an airport near here. The ___ one is about 90 miles away. A. busiest B. farthest C. newest D. nearest
10. — No ocean in the world is ___ the Pacific Ocean.
— That ’ s right! It’ s the biggest ocean in the world.
A. big than B. biggest than C. as big as D. as bigger as
Answers
Ⅱ . 1. more crowded 2. times 3. growing 4. writing 5. protection 6. deepest 7. conditions 8. Japanese 9. illnesses 10. remaining
Ⅲ . 1. putting; into 2. sold to; like 3. in danger; for 4. protect; from 5. much stronger 6. prevented/stopped; from 7. How long 8. used not to be/didn’ t use to be 9. as high as 10. How long
Ⅳ . 1-5 ACDBC 6-10 DBADC
范文五:【学海风暴】2015-2016学年八年级英语下册 Unit 10 I’ve had this bike for three years练习1
Unit 10 I’ve had this bike for three years
基础导练
Ⅰ . Translation.
1. 迄今;到现在为止 _______________
2. 不再…… _______________
3. 欢迎来到…… _______________
4. 察看;观察 _______________
5. 棋类游戏 _______________
6. grow up _______________
7. seem to do sth. _______________
8. at first _______________
9. for example _______________
10. play with _______________
Ⅱ . Fill in the blanks with the given tips, using their proper form.
1. Mr. Brown is the _____(make) of the food.
2. My father _____(work) in the middle school for twenty years.
3. These _____(scarf) are Ann’ s and Alice’ s.
4. Ann has had the sweater since she _____(be) five years old.
5. I think it’ s hard _____(ride) a horse. It’ s dangerous.
6. The children are playing in the _____(院子 ).
7. He cut the _____(木板 ) into two halves.
8. For _____(某种 ) reasons, Mr. Li left there without saying anything.
9. Jack is an _____(诚实的 ) boy, so we all like him very much.
10. Too much s_____ food is bad for your teeth.
Ⅲ . Complete the following sentences.
1. 我们已经从我们的卧室里清除了大量的物品。
We _____ _____ _____ _____ a lot of things from our bedrooms.
2. 我们已经决定每个人卖掉不再使用的五种物品。
We have decided to each sell five things that we _____ _____ use. 3. 自从我是一个孩子的时候我就拥有它们。
I’ ve had them _____ I _____ a child.
4. 说实在的 , 我现在已经一会儿也不玩了。
_____ _____ _____, I have not played for a while now.
5. 吉姆在日本三天了。
Jim _____ _____ in Japan _____ three days.
6. 怀特先生买这辆小汽车两年了。
Mr. White _____ _____ the car for two years.
7. 自从他来这儿以来,就在这家工厂工作。
He _____ _____ in this factory _____ he _____ here.
8. 虽然比尔很长时间没滑冰了,但现在他仍然滑得很好。
_____ Bill _____ _____ for a long time, he still _____ very well now. 9. 你来中国多长时间了?
_____ _____ have you _____ _____ China?
10. 至于旅馆,离海边有好几英里。
_____ _____ the hotel, it was miles from the sea.
能力提升
Ⅳ . Choose the best answer from the given choices.
1. What ___ honest boy! We should learn from him.
A. a B. an C. the D. /
2. The little girl didn’ t stop crying ___ she found her mother. A. after B. because C. until D. when
3. The children decide ___ their school yard this Friday afternoon. A. clean B. to clean C. cleaning D. cleaned
4. — ___ have you been in the sports club?
— Since the first month I came to the school.
A. How old B. How long C. How much D. How soon
5. My uncle has moved to Beijing. He doesn’ t live here ___.
A. at all B. no more C. any longer D. any time
6. — You speak English so well. ___ have you learned English? — For 5 years.
A. How long B. How many C. How often D. How far
7. — How long has Mr. Green lived in Lanzhou?
— He ’ s lived here ___ 1998.
A. for B. since C. at D. on
8. The woman ___ all of her money to charities ___ the poor.
A. gave off; to help B. gave up; helping
C. gave away; to help D. gave; helping
9. — When did you ___ the bike?
— In 2012. I have ___ it for two years.
A. buy; bought B. have; bought
C. bought; bought D. buy; had
10. — How much is the book?
— You can have it ___ two yuan.
A. at B. with C. for D. on
Answers
I. 1. so far 2. not...anymore 3. welcome to sp. 4. check out 5. board games 6. 长大;成长 7. 似乎要做某事 8. 起初;首先 9比如 10. 和……一起玩
Ⅱ . 1. maker 2. has worked 3. scarves 4. was 5. to ride 6. yard 7. board 8. certain 9. honest 10. sweet
Ⅲ . 1. have already cleared out 2. no longer 3. since; was 4. To be honest 5. has been; for 6. has had 7. has worked; since; came 8. Although; hasn ’ t skated; skates 9. How long; been in 10. As for
Ⅳ . 1-5 BCBBC 6-10 ABCDC