单项选择题

Plastic bags are useful for holding many kinds of food, ______ their cleanness, toughness, and low cost.

A．by virtue of
B．in addition to
C．for the sake of
D．as opposed to
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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
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
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