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
The medicine______his pain but did not cure his illness.
A．activated
B．alleviated
C．deteriorated
D．mediated
单项选择题
Early last year the company researched the possibility of______ a new late-night show.
A．launching
B．longing
C．leading
D．landing
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