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　　A. withdrawn B.vanished C.found D.hung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
　　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 won't allow any foreign country to _______ in our internal affairs.
　　A. devote B.district C.interfere D.wander
　　34.We can not _______ all the magazines together.
　　A. route B.draw C.thread D.bind
　　35.What he said in the meeting _______ everybody present.
　　A. disgusted B.dismissed C.disposed D.eliminated
　　36.Some lazy men would rather _______ than work.
　　A. indicate B.declare C.solve D.starve
　　37.This boy was _______ for what he had done in the class.
　　A. scolded B.overcome C.inclined D.displayed
　　38.Some states in the United States _______ people to carry guns.
　　A. apply B.charm C.ignore D.forbid
　　39.Carelessness made him fall in his job _______.
　　A.interview B.intention C.stomach D.stocking
　　40.Sometimes it is very difficult to _______ some of the English words. Even the native speaker can not help.
　　A. decrease B.create C.define D.delight
　　41.Students with _______ problems may apply for student loans.
　　A. economic B.financial C.male D.economical
　　42.Both sugar and salt can ______in water.
　　A. desert B.absorb C.dissolve D.involve
　　43.I have not heard anything from him since his _______.
　　A. departure B.fault C.foundation D.acciptance
　　44.Without a proper education， people could _______ all kinds of crimes.
　　A. conduct B.stoop C.commit D.sweat
　　45.Several loudspeakers are _______ from the ceiling and we can hear the speaker very clearly.
　　A. connected B.sustained C.associated D.suspended
　　46.This morning in the class， our teacher lost his _______ at last because he could not stand any more.
　　A. temper B.terror C.verse D.contain
　　47.It is not ——_______ for me to return all the books to the library now because I still need some of them for my research.
　　A. continuous B.difficult C.convenient D.sufficient
　　48.When traveling alone in the mountains， you'd better take a _______ with you in case you get lost.
　　A. compass B.compress C.complse D.campus
　　49.As a teacher， you should not _______ the students from asking questions in class.
　　A. ruin B.restrain C.import D.impose
　　50.If you have any problems during your study here， please do not _______ to call me for help
　　A. hesitate B.despair C.urge D.request
　　答案：
　　1.B 2.C 3.A 4.B 5.D 6.D 7.A 8.A 9.B 10.D 11.A 12.B 13.C 14.A 15.D 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.A 32.D 33.C 34.D 35.A 36.D 37.A 38.D 39.A 40.C 41.B 42.C 43.A 44.C 45.D 46.A 47.C 48.A 49.B 50.A