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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These are goods insured ( ) all risks.
A．with
B．against
C．in
D．/
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They describe how each process goes ( ) to the next.
A．before
B．on
C．in
D．/
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