A. withdrawn B. vanished C. found D. hung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

　　16~30参考答案：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

　　31. The college students in China are _______ from smoking on campus because this will do them no good.　　A. discouraged B. observed C. obeyed D. obtained

　　32. Professor Smith is also the _______ of the international program office. If you have any problem when you study here, you may go to him for help。

　　A. detective B. president C. manager D. director

　　33. We wont allow any foreign country to _______ in our internal affairs。

　　A. devote B. district C. interfere D. wander

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