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 relationship between employers and employees has been studied（）.

A．originally
B．extremely
C．violently
D．intensively
单项选择题
You have nothing to （） by refusing to listen to our advice.

A．gain
B．grasp
C．seize
D．earn
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