2. 外语
  3. Our research has focused on a drug which is so______as to be able to change brain chemistry.

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

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问题 Our research has focused on a drug which is so______as to be able to change brain chemistry.
选项 A、powerful
B、influential
C、vigorous
D、mortal
答案A
解析 形容词词义辨析题。题意：“我们的研究重点是一种药品，它的药力很大，足以改变大脑的化学组成。”A powerful：强大的，有力的，符合题意。B influential：有影响力的，有权势的。C vigorous意为“积极的；精力充沛的”。D mortal：终有一死的；致命的。
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