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
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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
单项选择题
The relatively theory is basically made up of two parts: the restricted and the general relativity theory.
A．fundamentally
B．usually
C．frequently
D．approximately
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