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
Embroidery depicting scenic views became popular in the United States toward the end of the eighteenth century.
A．stating
B．relating
C．portraying
D．celebrating
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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