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
The advanced life forms in nature are all symmetrical, instead of being ______ .
A．separated
B．disproportionate
C．mutable
D．imprecise
单项选择题
The bond of true affection had pulled us--six very different men from six different countries-across Antarctica; we proved in the end that we weren't very different ______ .
A．for all
B．as usual
C．in particular
D．after all
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