一、 1. D 2. C 3. A 5. B
二、 1. No one has discovered any life 2. we have already sent them 3. but she has never been 4. I saw him showing the foreignvisitors around
三、阅 1. In 1961. 2. It sent the first space station intospace. 3. A space station. 4. Until the late 1980s. 5. The history of space stations and whatthe life in space stations is like.
四、 1. C 2. B 3. A 4. D 5. B 6. C 7. A 8. C 9. B 10. A
五、Scientists think that therehas been life on earth for hundreds of millions of years. Seven other planetsgo around the sun like the earth. However, none of them has an environment likethat of the earth. So scientists do not think they will find life on them. The sun and its planets are called the solarsystem. And our solar system is a small part of a much larger group of starsand planets. We call it Galaxy. Scientists have also discovered many othergalaxies in the universe. So it is impossible to imagine how large the universeis. We have always asked the question:With so many stars in the universe, are we alone? Is there life out there inthe space? We’re looking forward to knowthe answer.
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