16. In order to increase our output, we need to import more production _______.

A. facilities       s

17. When a spacecraft travels, one of the major problems is reentry into the Earth’s _______.

A. surface   B. atmosphere   C. attitude   D. bent

18. This river forms a natural _______ between China and Korea.

A. boundary   B. string   C. spot   D. zone

19. She is already 16years old. But she _______as if she were still a little girl.

A. believes   B. absorbs   C. accrses   D. behaves

20. We are _______ at the rapid progress Mark has made in this semester.

A. distinguished   B. annoyed   C. astonished   D. scored

21. The doctors _______ the medicines to the people in the flood area.

A. distributed   B. packed   C. prayed   D. undertook

22. Much of the news provided by this newspaper is _______, not foreign.

A. domestic   B. strain   C. purchase   D. murder

23. He tried to _______ relations with his former wife but he failed.

A. measure   B. maintain   C. shelter   D. reply

24. He _______ to study harder in the future so that he could have more opportunities to find a better job.

A. resolved   B. resorted   C. requested   D. reserved

25. The _______ work continued for more than a week but there was still no sign of the missing boy.

A. research   B. rescue   C. vessel   D. vast

26. Many kinds of animals are believed to have _________ from the earth

A. withdrawn   B. vanished   C. found   D. hung

27. The engineers in this lab spent several weeks _______ their plans for the new bicycle.

A. counting   B. stripping   C. elaborating   D. casting

28. Pine trees are usually believed to _______ cold weather.

A. guard   B. accomplish   C. roar   D. endure

29. Free medical service is _______ to nearly all the college students in China.

A. favorite   B. available   C. convenient   D. average

30. After working for twenty hours without any rest, the doctors were _______.

A. exhausted   B. mounted   C. wrapped   D. restored

参考答案：16. A   17. B   18. A   19. D   20.C   21.A   22.A   23.B   24.A   25. B   26. B   27. C   28. D   29. B   30. A