单项选择题

( )is a major port of German.

A．Helsinki
B．Gdynia
C．Hanoi
D．Kiel
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Theory is based on practice and( )turn serves practice.
A．in
B．by
C．at
D．on
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
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