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5. Our research has focused on a drug which is so        as to be able to change brain chemistry.

   A. practical   B. influential

   C. fearful   D. powerful

5. D powerful此处意为"有效力的(=have a strong effect on) "

题目来源:高考英语组合训练多项选择+完成句子 > 组合训练23-24

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