单项选择题：自治区的自治条例和单行条例生效的条件是( )。A．自公布之日起生效 B．报全国人大

题型：单项选择题

阅读理解。

As space science develops, man has learned 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 (辐射) 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. The harm of the radiation won't be found until their children even grandchildren are born.

Some special medicine may work a little, but no really effective medicine has been found so far.

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.

1. ______ shows the man-made things in space in the correct way.

A B C D

2. The radiation from the sun and other stars is ______ to spacemen.

A. good

B. helpful

C. useful

D. harmful

3. The underlined word "fragments" means "______".

A. 碎片

B. 泡沫

C. 烟雾

D. 飞碟

4. The passage talks about _______ kinds of danger in space.

A. two

B. three

C. four

D. five

5. 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.

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自治区的自治条例和单行条例生效的条件是( )。A．自公布之日起生效 B．报全国人大