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

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　　A. withdrawn B.vanished C.found D.hung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