单项选择题

The loading, unloading, transshipment and transit of inward and outward mail bags are subject to Customs control and a ______ wya bill should be submitted to the Customs by the enterprise providing prviding postal service.

A．cover
B．covering
C．covered
D．haveing covered
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单项选择题
Impostion of a discriminating duty belongs to the tariff rates falling into the category of ______.
A．general rates
B．preferential rates
C．ad valorem duty rates
D．special duty rates
单项选择题
If you are interested, we will send you a sample lot ______ charge.
A. within
B. for

C. free of
D. with
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