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
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We understand you have over 20 years' experience ______ this particular line of business.
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B．of
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单项选择题
Rotterdam is one of the port cities of ______.
A. Germany
B. England
C. France

D. Dutch
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