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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
答案:28.D 29.B 30.A