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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When we placed our order ______ you we stressed that the goods would be required for winter sales in this country.
A．to
B．with
C．on
D．against
单项选择题
Will you please remit the extra charges to the City-Bank New York ______ our credit
A．by
B．for
C．across
D．over
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