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 题目和参考答案——青夏教育精英家教网—

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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) "

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