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、monstrous
D、vigorous

答案A

解析 (Powerful强有力的,有效力的)。句意为:我们的研究集中在一种药物上,该药的效力足以改变大脑的化学组成。B.influential有影响力的;C.monstrous可怕的、极恶的;D.vigorous精力旺盛的。
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