单项选择题

Theory is based on practice and( )turn serves practice.

A．in
B．by
C．at
D．on
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单项选择题
Our project must proceed at a reasonably quick tempo. Surely one month is ample time, ( )
A．isn't it
B．is it
C．it isn't
D．it is
单项选择题
汉译英：“收款人；说明书”，正确的翻译为：( )
A．payee; specimen
B．payer; specimen
C．payer; specification
D．payee; specification
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