单项选择题

Oil sales volume in local urban and rural areas rose 23 percent and 48 percent _________over March 1997.

A．independently
B．respectively
C．individually
D．separately
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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．efficient
D．potential
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
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