皮皮学，免费搜题
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【单选题】
Our headmaster accepted the suggestion by students.A.
put forward
B.
put up
C.
put away
D.
put off
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皮皮学刷刷变学霸
举一反三
【单选题】Over the past l00 years，sea level steadily as a result of global warming．
A.
had increased
B.
has been increasing
C.
increased
D.
is increasing
【简答题】无阻尼单自由度体系的自由振动方程，其通解为$y(t) = {C_1}sin omega t + {C_2}cos omega t$，则质点的振幅为（ ）。
【简答题】As more and more people speak the global languages of English, Chinese, Spanish, and Arabic, other languages are rapidly disappearing. In fact, half of the 6,000-7,000 languages spoken around the worl...
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