1. 阅读下列短文，从每题所给的A、B、C和D项中选出最佳选项。

    As space science develops, man has learnt more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger as well as success.

    Scientists have found out that the radiation is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of the radiation from the Sun and other stars, which is bad for their health.

    Space rubbish is also a great danger to spacemen. It's reported that there were 9,000 man-made things flying in space. About 30% of these are satellites, 10% are spaceships, and the rest space rubbish. A small piece of these can knock a spaceship window and cause some damage.

    Scientists are watching and reporting any possible danger all the time. They are working to deal with space rubbish. Although space is really dangerous, it interests many people on Earth. In the near future, it may become possible for people to spend a few days in a space hotel. We may even choose to leave the Earth and live in space in a few years. So we should do something to help improve the space environment.

1. （1） The underlined word "radiation" in Paragraph 2 means "_______".

   A . 辐射 B . 失重 C . 压力 D . 缺氧
3. （2） The radiation from the Sun and other stars is _______ to spaceman.

   A . good B . bad C . four D . five
5. （3） The passage talks about _______ kinds of danger in space.

   A . two B . three C . four D . five
7. （4） Which of the following is TURE according to the passage?

   A . Scientists have found out ways to solve any problem in space. B . It is sure that we can have a travel to space in ten years. C . A small piece of space rubbish can be a great danger. D . Space is really dangerous, so it doesn't interest anyone on Earth.