水利工程保修期从工程移交证书写明的工程（）日起计算。
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In the second paragraph, the word "track" could best be replaced by which of the following
A. Band.
B. Rails.
C. Path.
D. Sequence.
The word "drowsy" in the last paragraph means ______.
A. sick
B. asleep
C. a little sleepy
D. nosy
碾压混凝土的VC值太大，说明（）。
A. 拌合料湿，不易压实
B. 拌合料湿，灰浆太少
C. 拌合料干，不易压实
D. 拌合料干，灰浆太多
In the author's opinion, young people can learn a lot during the days they spend "hostelling" because ______.
A. they meet a lot of people from different places
B. they have such useful classes in the hostel as they don't have in schools
C. they have more interesting activities than at school
D. they are very much interested in life in the hostel
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