单项选择题

Bill is an example of a severely disabled person who has become ______ at many survival skills.

A．proficient
B．persistent
C．consistent
D．sufficient
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单项选择题
Our research has focused on a drug which is so ______ as to be able to change brain chemistry.
A．powerful
B．influential
C．monstrous
D．vigorous
单项选择题
A terrible traffic accident happened; people were saddened as they watched the ______ sight on TV.
A．panic
B．patriotic
C．pathetic
D．periodic
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