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
The flashing red light served as a ______ of danger ahead.
A．predictor
B．caution
C．precaution
D．prevention
单项选择题
The book contained a large ______ of information.
A．deal
B．amount
C．number
D．sum
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