单项选择题

You have to be ______ when you try to work out mathematical formulas.

A．reasonable
B．rational
C．logical
D．sound
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单项选择题
This new laser printer is______ with all the leading software.
A．competitive
B．cooperative
C．compatible
D．comparable
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She answered with an_______ No to the request that she attend the public hearing.
A．eloquent
B．effective
C．emotional
D．emphatic
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