2011下半年英语四级考试单项选择训练六
2011下半年英语四级考试单项选择训练六26.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A. withdrawn B.vanished C.found D.hung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
26.B 27.C 28.D 29.B 30.A
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