(一)从下面 A、B、C、D 四个选项中选出一个最佳选项。
( )1. A. thank B. forget C. meet D. teach
( )2. A. plans B. skills C. mistakes D. problems
( )3. A. farmers B. friends C. neighbours D. classmates
( )4. A. widely B. luckily C. recently D. suddenly
( )5. A. kind B. polite C. smart D. famous
( )6. A. stop B. finish C. change D. decide
( )7. A. Before B. After C. If D. When
( )8. A. in B. for C. with D. like
( )9. A. him B. them C. her D. you
( )10. A. heavy B. small C. soft D. wet

1. A 2. D 3. B
4. D 【解析】根据空后的“they have to think about how to solve it quickly”可知，如果他们的任务突然（suddenly）出现问题，他们必须快速想出解决方法。
5. C 【解析】根据空后的“strong and ready for any difficulty”可知，航天员必须要聪明（smart）、强壮并且能随时应对任何困难。
6. B 【解析】根据空后的“return to the earth safely”可知，航天员们应该是先完成任务，然后再返回地球。
7. A 8. B 9. B 10. A

(二)阅读短文,根据短文内容回答问题。
1. How many Chinese astronauts have been to space since 2003?
________
2. What does the underlined word “they” in Paragraph 2 refer to?
________
3. What kind of exercise helps astronauts get ready for being weightless?
________

1. Over 20/twenty. 2. Astronauts.
3. The underwater exercise.