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

A. facilities B.hens C.votes D.artists

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

A. surface B. atmosphere C. attitude D. bent四级分值

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A. withdrawn B. vanished C. found D. hung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