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
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
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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