请仔细阅读下文,然后根据短文内容选择正确答案。 If someone ask you, "What colour is the sky?"I think
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请仔细阅读下文,然后根据短文内容选择正确答案。 |
If someone ask you, "What colour is the sky?"I think you will answer "Blue".I"m afraid that you will be wrong. The sky has no colour. It looks blue because we are looking at blue sunlight. The sunlight is shining on little bits of dust ( 灰尘) in the air. Is the sky full of air? I"m sure that you have asked this question, too. We know that there is air all around the world, but we couldn"t fly very high because as we go higher, the air gets thinner. If we go far enough away from the earth, we find there is no air. Maybe we can answer some questions now. What is the sky? Where is it? It is all round the world. The sky is space (宇宙空间). In space there is nothing, but only the sun, the moon, and all the stars. |
1. We often think the sky is blue because _____. |
A. we think it is so B. we like this colour C. we don"t have other colours D. we don"t like other colours |
2. The sky is _____. |
A. a star round it B. a big ball with air all C. full of dust D. space with the sun, the moon and the stars |
3. What makes us think the sky is blue? |
A. Dust in the sky. B. Air and blue light. C. Our own feeling. D. Both A and B. |
4. We can"t fly very high because _____. |
A. there"s too much air in the high place B. the high sky is full of dirty air C. there is no air in the high enough sky D. the sun is too hot |
5. The writer of the passage _____. |
A. tells us something about the sky B. wants to tell us not to go to space C. once flew in the sky D. enjoys answering people"s questions |
答案
1. A 2. D 3. D 4. C 5. A |
举一反三
阅读理解。 |
Scientists have always wanted to know more about the universe. Years ago they knew many things about the moon. They knew how big it was and how far away it was from the earth. But they wanted to know more about it. They thought the best way was to send men to the moon. The moon is about 384 000 kilometers away from the earth. A plane cannot fly to the moon because the air reaches only 240 kilometers away from the earth. But something can fly even when there is no air. That is a rocket(火箭) How does a rocket fly? There is gas(气体)in the rocket. When the gas is made very hot inside the rocket, it will rush out of the end of the rocket, so it can make the rocket fly up into the sky. Rockets can fly far out into space. Rockets with men in them have been to the moon. Several rockets without men in them have flown to another planet(行星)much farther away than the moon. One day rockets may be able to go to any place in space. |
1. Scientists have known _____ the moon is. |
A. how long B. how heavy C. how old D. how big |
2. The earth is about 384 000 kilometers away from the _____. |
A. space B. universe C. sun D. moon |
3. A plane cannot fly to the moon because _____. |
A. there is no air 240 kilometers above from the earth B. there is no gas in the plane C. the plane is not strong enough D. the plane must be driven by a man |
4. The hot gas in the rocket is used for _____. |
A. keeping the air in the rocket fresh(清新的) B. keeping the men in the rocket warm C. making the rocket fly up D. cooking food for the men |
5. Several rockets without men in them have flown to _____. |
A. the stars B. the satellites of the sun C. the sun D. another planet of the sun |
完形填空。 |
Even if you are a good high-jumper, you can jump only about seven __1__ off the ground. You cannot jump any higher because the earth __2__ you hard. The pull of the earth is__3__ gravity (引力). You can easily __4__ out the pull of the earth. If you weigh __5__ , you will know how__6__ gravity is pulling you. Since there is gravity, water runs downhill. when you__7_ a ball into the air, it falls back down. Because of gravity, you do not fall off the earth __8__ it turns around. Then, can you get __9__ from the earth and go far out into space? Now you can do it, because spaceships have been invented. The spaceship will go fast that it can get rid of (除掉) the earth"s gravity and __10__ you into space. |
( ) 1. A. kilometer ( ) 2. A. pulls ( ) 3. A. said ( ) 4. A. find ( ) 5. A. myself ( ) 6. A. much ( ) 7. A. fly ( ) 8. A. as ( ) 9. A. off ( ) 10. A. get | B. foot B. push B. called B. look B. yourselves B. many B. throw B. and B. away B. bring | C. feet C. makes C. told C. saw C. you C. heavy C. get C. because C. lost C. carry | D. kilometers D. hits D. spoken D. watch D. yourself D. long D. make D. or D. left D. throw |
完形填空。 Some people think that they will get ill if they use their brains 1 It is not 2 . It"s known to all that the more you use your brains, the beller they will be, and the wiser you will 3 . Of course. if you want to make your mind 4 clear and bright, you must 5 a rest. To middle school students, 6 their brains in the morning is good for 7 . There are many 8 to rest, for example, sleep, take a walk outdoors or do morning exercises.In 9 life, to eat some eggs, meat, fresh vegetables and fruit 10 good for the brains. Wish you a wise man. |
( )1. A. very ( )2. A. as ( )3. A. change ( )4. A. hope ( )5. A. take ( )6. A. use ( )7. A. them ( )8. A. places ( )9. A. every day ( )10. A. is | B. much B. it B. look B. know B. let B. uses B. you B. ways B. everyday B. was | C. best C. that C. become C. do C. give C. used C. us C. rooms C. each day C. are | D. many D. such D. turn D. keep D. make D. using D. me D. days D. any day D. were | 阅读下面的短文并选择合适的答案完成这篇短文。 Plants are very important living things. Life can not go on 1 plants. This is because plants can make food 2 air, water and sunlight. Animals and man 3 do so. Animals get their 4 by eating plants 5 animals, Man gets his food 6 eating plants and animals, 7 . So animals and man 8 plants to live. This is 9 we find there are so many 10 around us. | ( )1. A. with ( )2. A. with ( )3. A. mustn"t ( )4. A. food ( )5. A. too ( )6. A. with ( )7. A. too ( )8. A. want ( )9. A. why ( )10. A. animals | B. without B. about B. needn"t B. water B. also B. of B. also B. wants B. how B. plants | C. no C. from C. can"t C. drink C. and C. by C. or C. needs C. which C. air | D. off D. of D. may not D. animals D. so D. from D. so D. need D. what D. livig things | 完形填空。 | CONCORDE, the world"s fastest passenger plane, will soon be over 33 years old. It first 1______ on 2 March 1969 in France. Concorde was developed by both France and Britain. From 1956 these two countries had a 2______ of a supersonic passenger plane. In 1962 they started to 3______ together on the project. The plane 4______ over 1.5 billion pounds to develop. It is the most tested plane in the history. It was given over 5000 hours of testing. Concorde flies at twice the speed of 5______. This means that it 6______ only 3 hours 25 minutes to fly between London and New York, compare with 7-8 hours in other passenger jets. Because of the five-hour time difference between the USA and Britain, it is 7______ to travel west on Concorde and arrive in New York before you leave London! You can catch the 10:30a.m. 8______ from London, Heathrow and start work in New York an hour 9______! Concorde is much used by business people and film stars. Each Concorde is built at a cost of 55 million pounds. Twenty have been built so far. Air France and British Airway 10______ the most. They each have seven planes. |
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