Our research has focused on a drug which is so ______ as to be able to change br

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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

解析形容词辨析。powerful具有“有效的”之意，可以构成修饰搭配powerful drug；influential意为“有影响的”，monstrous意为“巨大的”，vigorous意为“精力充沛的”，均不符合句意。

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