单项选择题

Lack of confidence in his own abilities is the chief defect in Mike's character.

A．defeat
B．effect
C．weakness
D．device
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单项选择题
One type of detective story features a brilliant amateur who, by perceptively analyzing motives and clues, solves crimes that are baffling to the police.
A．revealed by
B．predicated by
C．alarming to
D．perplexing to
单项选择题
Scientists are expected to carry out thoroughgoing studies to back up claim's made concerning new drugs.
A．support
B．elevate
C．investigate
D．challenge
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