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单选题
_____
A
introduction
B
reduction
C
discount
D
deduction
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参考解析
解析：
reduction减少；下降；缩小。deduction扣除，减除；推论。discount折扣。introduction引进，介绍。智力指的是吸毒者数量的减少，因此用reduction，选B。
reduction减少；下降；缩小。deduction扣除，减除；推论。discount折扣。introduction引进，介绍。智力指的是吸毒者数量的减少，因此用reduction，选B。
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