题目内容：

 

Space rubbish is also thought to be 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 are space rubbish. An explosion(爆炸)in space in 1999 made a cloud of 300,000 fragments, each at least 4mm in size. A small piece of these even knocked a spaceship window and caused some damage（损坏）.

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 the 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.

根据短文内容，选择正确答案。

1.Of all the man-made things in space, about ________of  these are space rubbish.

A. 10%          B.60%

C.100%          D.30%

2.The underlined word “fragments” means “______”.

A. 碎片         B. 泡沫

C. 烟雾         D. 飞碟

3.The passage talks about _________ kinds of danger in space.

A. two           B. three

C. four         D. five

4.Which of the following is TRUE?

A. Scientists have found out ways to solve any problem in space.

B. Every one of us can have a travel to space in ten years.

C. The harm of the radiation may be found in the spacemen’s children.

D. Space is really dangerous, so it doesn’t interest anyone on the earth.