Mrs.Smith often tells her son ________ too much meat.

A. don't eat B. not eat C. to not eat D. not to eat

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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.

Scientists have found out that radiation(輻射) is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of radiation from the sun and other stars, which is bad for their health. Some special medicine may work a little, but there’s no really helpful medicine.

Space junk is also thought a great danger to spacemen. It’s reported that there are 9,000 man-made things flying in space. About 30% of these are man-made satellites(衛(wèi)星),10% are spaceships, and the rest are space junk. An explosion(爆炸) in 1996 made a cloud of 300,000 fragments(碎片), each at least 4 mm in size, and even a small piece of these knocked against a spaceship window and did some damage. Scientists are working on helpful ways to do with space junk.

Although space is really dangerous, it interests everyone on the earth. In the near future, it may become usual for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space for a few years. So we should care for space and do something to help improve the space environment.

1.________ of man-made things in space are space junk.

A. 10% B. 30% C. 60% D. 80%

2._______ is/are the most dangerous to spacemen.

A. Satellites B. Radiation C. Fragments D. Space junk

3.What can people do in space in the near future? ________

A. They can only live and travel in space.

B. They can grow some fruit and vegetables in space.

C. They can find out ways to solve all the problems in space.

D. They can spend a few days or live for a few years in space.

4.The purpose(目的) of the writer who writes the passage is mainly to _________ .

A. introduce what the space is like to us

B. talk about some important space travels

C. tell us the space environment and to care for space

D. show us how interesting the life of the spacemen in space

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--- How many students are there in each group?

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（題文）—Why are you so upset，Nancy? —I didn't ________ the math exam.

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Larry wants to fix up these bikes and ________ to the poor children.

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Look! A ________ man is crossing the street.Let's go and help him.

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Did you agree ________ a party for him?

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— How _______ is it from Xi'an to Dunhuang? — It's less than 3 _______ flight.

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I_______this mobile phone online. It is not worth buying.

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