单项选择题

Many important scientific discoveries are in fact _________ones as they were made by chance.

A．relative
B．temporary
C．subordinate
D．accidental
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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
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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