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
Preceding the commotion of a battle, there is usually an unusual （）.

A. changeability
B. likeability
C. desirability
D. tranquility
单项选择题
It is offence to show （） against people of different races.

A. distinction
B. difference
C. separation
D. discrimination
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