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
答案:
21.A 22.A 23.B 24.A 25.B
26.B 27.C 28.D 29.B 30.A
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