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
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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
单项选择题
The little boy ______ his father by begging over and over to go to the zoo.
A．plagued
B．preyed on
C．prevailed upon
D．raided
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