2011下半年英语四级考试单项选择训练六

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        　　A. withdrawn B.vanished C.found D.hung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