单项选择题

Very few people could understand his lecture because the subject was very ______.

A．faint
B．indefinite
C．obscure
D．gloomy
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单项选择题
Many new ______ will be opened up in the future for those with a university education.
A．opportunities
B．realities
C．necessities
D．probabilities
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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