The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down?
There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋轉) of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.
Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (墜落) down to the earth.
1.Which of the following uses of satellites is NOT mentioned?
A. communication
B. monitoring the weather condition
C. doing some research
D. taking pictures
2.The force that pulls the satellite towards the earth is created by ________.
A. the earth
B. the satellite itself
C. the rotation of the satellite
D. the rope
3.Why can’t the satellites fly away?
A. Because of the force from the earth.
B. Because the satellite is too big.
C. Because of the force created by the rotation of the satellite around the earth.
D. Because people on earth have made ropes to tie the satellites tightly.
4.The satellite will finally crashes down to the earth ________.
A. when it flies faster
B. when its speed slows down
C. when people cut the rope
D. when there is no electricity in it
5.Which of the following is TRUE according to the passage?
A. There are four forces acting on the satellite.
B. The force of gravitation makes the satellite go round and round.
C. As time goes by, the satellite will finally fall down.
D. The satellite will stay in space forever.
1.D
2.A
3.A
4.B
5.C
【解析】短文屬于說明文。介紹了人造衛星不會墜落的原理。
1.細節理解題。從第一段第二句“…are used for communication, weather monitoring and research.”可知沒提到D項。
2.推理判斷題。從第二段最后一句“The gravitational pull of the earth”可知地心引力來自于地球。
3.綜合理解題。從第二段第二句“…tries to pull the satellite towards the earth”和最后一句“…keeps the satellite from flying away”可知：是因為地心引力。
4.細節理解題。從短文后兩句“…loses its speed…crash down to the earth”可知。
5.綜合理解題。通讀全文，可知A、B、D三項不符合文意；C項與短文最后一段吻合。
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Scientists are very interested in the Universe，and they always want to know more about it. Years ago they knew many things about the moon. They knew how big it is and how far away it is 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（氣體） 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 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.
【小題1】Scientists knew ____________ the moon is.
A: how far B: how big C: how old D: both A and B
【小題2】The earth is about 384,000 kilometers away from the _____.
A: space B: universe C: sun D: moon
【小題3】A plane cannot fly to the moon because ___________
A: there is no air above 240 kilometers away from the earth.
B: there is no gas in the plane
C: the plane is not strong enough
D: the plane can not fly a long way
【小題4】The hot gas in the rocket is used for___________
A: keeping the air in the rocket fresh(新鮮的)
B: Keeping the men in the rocket warm
C: making the rocket fly up.
D: cooking food for the men
【小題5】What is the writer’s attitude(態度) to the universe’s future.
A: Realistic(現實的) B: Imaginative(幻想的)
C: Confident(有信心的) D: Sad
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How does a rocket fly? There is gas（氣體） 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 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.
【小題1】Scientists knew ____________ the moon is.
A: how far B: how big C: how old D: both A and B
【小題2】 The earth is about 384,000 kilometres away from the _____.
A: space B: universe C: sun D: moon
【小題3】A plane cannot fly to the moon because ___________
A: there is no air above 240 kilometers away from the earth.
B: there is no gas in the plane
C: the plane is not strong enough
D: the plane can not fly a long way
【小題4】 The hot gas in the rocket is used for___________
A: keeping the air in the rocket fresh(新鮮的)
B: Keeping the men in the rocket warm
C: making the rocket fly up.
D: cooking food for the men
【小題5】 What is the writer’s attitude(態度) to the universe’s future.
A: Realistic(現實的) B: Imaginative(幻想的)
C: Confident(有信心的) D: Sad
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1. What is the writer’s favourite room?
A. The Launch Pad.
B. The rooms on space technology.
C. The Human and Nature room.
D. The Rocket Show.
2. What can’t you do in the Science Museum?
A. Touch the machines.
B. Do chemistry experiments.
C. Take photos of the exhibits.
D. Talk loudly about what you see.
3. How much does it cost to go into the Science Museum?
A. $10 for adults. B. $6 for children.
C. Only free for children. D. Free for everyone.
4. How long can you stay at the Science Museum?
A. 6 hours. B. 8 hours. C. 10 hours. D.12hours.
5. In what way is the Science Museum different from other museums?
A. We can see a lot of exhibits in the Science Museum.
B. People can talk to each other in the Science Museum.
C. There’s no shouting and no running in the Science Museum.
D. You can work things out and try out your ideas in the Science Museum.
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