单项选择题

He had tried to ______ sleep by all his usual methods, but with no success.

A．secure
B．induce
C．impact
D．infer
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单项选择题
His theories were so ______ that few could see what he was trying to establish.
A．logical
B．scholarly
C．theoretical
D．vague
单项选择题
The new secretary has written a remarkably ______ report only in a few pages but with all the details.
A．concise
B．clear
C．precise
D．elaborate
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