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  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、monstrous
D、vigorous
答案A
解析 考查形容词辨析。句意为“我们的研究集中在一种______能够改变大脑化学的药物上”。powerful“强有力的”，influential“有影响的，有势力的”，monstrous“巨大的”，vigorous“精力旺盛的，强健有力的”。这四个形容词中，只有powerful(有效力的)可与表示药物的名词搭配。故选A。
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