单项选择题

The purpose of a ______ is to cut down imports in order to protect domestic industry and workers from foreign competition.

A．tax
B．toll
C．fee
D．tariff
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单项选择题
We have no figures on the number of workers employed in the ______ stages of iron production.
A．various
B．variable
C．varied
D．variant
单项选择题
Although the false banknotes fooled many people, they did not ______ close examination.
A．put up
B．keep up
C．stand up to
D．look up to
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