单项选择题

Smuggling is a ______ activity which might bring destruction to our economy; therefore, it must be banned.

A．pertinent
B．fruitful
C．detrimental
D．casual
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单项选择题
For nearly 50 years, Spook has been a ______ author writing 13' books including an autobiography and numerous magazine articles.
A．prevalent
B．stand up to
C．prospective
D．prolific
单项选择题
A knowledge of history ______ us to deal with the vast range of problems confronting the con temporary world.
A．equips
B．provides
C．offers
D．satisfies
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