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【多选题】
文献综述的目的是（ ）A.
了解问题的历史
B.
现状和趋势
C.
学习别人的方法
D.
提供背景资料
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I didn’t sleep well last night because of the noise. It was not until midnight ___ the noise in the street stopped.
A.
that
B.
when
C.
since
D.
at which
【单选题】I didn’t sleep well last night because it was too _______ outside.
A.
noisy
B.
quiet
C.
noise
D.
Loud
【单选题】I didn’t sleep well ________ the noise from that factory nearby.
A.
because
B.
because of
C.
Unless
【简答题】轻型井点设备主要有井点管、弯联管、 及抽水机等组成。
【单选题】I didn’t sleep well last night as all the heating __________.
A.
went off
B.
went on
C.
went up
D.
went down
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