The scientific group is carrying out a research focused on a drug which is so __

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问题 The scientific group is carrying out a research 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此处指“(药等)效力大的”，符合本题题意。influential意为“有影响的，有权势的”；monstrous意为“怪异的，宏大的”；vigorous作“精力充沛的，强有力的”讲。因此A为正确选项

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