Many people believe that the Moon was once part of the Earth and broke away millions of years ago.
There are high mountains, deep valleys and wide flat spaces on the Moon. Animals and plants can’t live on the Moon because it has no air or water. There are no clouds, no rain and no snow, either.
Sound needs air to travel.
The Moon has no light of its own. It looks bright because the Sun’s light shines on it. During the day, the rocks become hotter than boiling water.
The Moon is about 383 thousand kilometers away from the Earth.
| A．There is no air on the Moon. |
| B．It takes a spaceship about three days to reach the Moon. |
| C．Other people say that it came from another part of space. |
| D．This is because the Moon is closer to the Sun than the Earth. |
| E．Nobody lives on the Moon. |
相似题推荐
【推荐1】We have seen lots of science fiction movies about aliens. People travel to stars and even fight with aliens in the movies. But are there real aliens in the universe（宇宙）? Most of us think it is impossible, just like fairy tales. But the answer of some scientists is yes. So they have been searching for aliens in outer space for many years. They hope to find life signs of aliens.
Some scientists are used to using radio telescopes（望远镜）to search for aliens in space. In order to find aliens, they have worked hard for over half a century, but so far they have found nothing. Then some scientists guessed aliens might not want to connect us, but aliens could answer our messages. So some scientists sent radio signals into the universe. They hope one day they would be picked up by alien technology. These scientists want to prove（证明）that we are not alone in the universe.
But what should we do if the “alien phone” rings one day? Should we answer it? Stephen Hawking, the famous physicist, thought it could be dangerous to connect aliens. He said that the main purpose of aliens’ visiting to the earth could be searching for our resources（资源）. But other scientists think we have no need to worry. David Morrison, a NASA scientist, said, “If an alien radio signal reaches the earth from a planet thousands of light-years away, then they almost surely have solved all the problems we still have including the short of resources. Maybe they are much smarter than us, but why do they want to hurt us? I think we can try to connect them.”
根据短文内容，选择最佳答案。
1. ________ scientists believe there are aliens.
| A．Few | B．All | C．Most | D．Some |
| A．50 years | B．more than 50 years |
| C．40 years | D．more than 100 years |
| A．Aliens are friendly. | B．Aliens are dangerous. |
| C．Aliens can’t be found. | D．Aliens have been on the earth. |
| A．Because we want to find aliens. |
| B．Because aliens have many skills. |
| C．Because we want to help aliens. |
| D．Because aliens are much smarter than us. |
| A．Are We Alone? | B．Stephen Hawking’s Idea |
| C．Protect Our Earth | D．How to find aliens |
【推荐2】Have you ever seen the day begin? The dark sky starts to look brighter. Then suddenly the sky is all pink and red and gold even a little green. The earth has turned bright until the sun is shining on the place where you are. This is what makes it day.
The sun is always shining, but it can only shine on one side of the earth at a time. It can’t light the side that is away from it. When the sun is shining on the other side of the world, it is night where you are. At night, you can see the stars.
All day the stars are in the sky, but the light from the sun is so bright that you can’t see them. When the sun is gone, the stars are bright enough to see. Stars look as tiny as pinheads (针头), but some are even bigger than the sun. Big things look little when they are far away. In the sky, planes look like toys, but on the ground you can see that they are big. Stars are millions of times bigger than planes. They look very small because they are so far away. The sun is closer than the other stars. So it looks bigger.
1. We can’t see the stars in the sky because ________.| A．it’s dark | B．when the sun is gone |
| C．the light from the sun is not bright | D．the light from the sun is so bright |
| A．when they are far away | B．when they are close to us |
| C．when the sun is too bright | D．when the sun is gone |
| A．Farther than the others. | B．Closer than the others. |
| C．Bigger than the others. | D．Brighter than the others. |
| A．it is bright | B．it is darker | C．it looks brighter | D．it is night |
【推荐3】We all know the Sun is important. It gives sunshine to plants, animals and people on the Earth.
We can also turn the Sun’s light into electricity. It has something to do with solar panels（太阳能电池板）.
But what happens when it is cloudy or rainy? Solar panels cannot collect energy from sunlight on cloudy and rainy days.
At the same time, solar energy is good for the environment.
| A．They collect energy from sunlight to make electricity. |
| B．It will not pollute the air and water. |
| C．But how does the Sun do that? |
| D．People started to use solar energy many years ago. |
| E．It can produce electricity from water. |
| F．You can do many things to protect the environment. |
| G．We needn’t worry about it. |
