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．efficient
D．potential
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单项选择题
However, at times this balance in nature is _________, resulting in a number of possibly unforeseen effects.
A．confused
B．disturbed
C．troubled
D．puzzled
单项选择题
The development history of the society tells us that man has _________ from the ape.
A．revolved
B．evolved
C．involved
D．dissolved
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