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
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( )is a major port of Italy．
A．Messina
B．Muscat
C．Istanbul
D．Karachi
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The currency of Argentina is( )．
A．afghani
B．lira
C．markka
D．peso
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