单项选择题

The main purpose of the Customs supervision and control is to ______ China, seconomic, trade, scientific, technological and cultural exchanges with other countries.

A．supervise
B．control
C．promote
D．limit
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We usually accept payment by irrevocable L C payable ______ shipping documents.
A．among
B．between
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A．adjust
B．readjust
C．accept
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