单项选择题

They describe how each process goes( )to the next.

A．befor
B．on
C．in
D．/
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单项选择题
I think you probably know China has adopted a flexible policy( )her foreign trade.
A．on
B．with
C．in
D．under
单项选择题
( )is a major port of Italy．
A．Messina
B．Muscat
C．Istanbul
D．Karachi
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