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、influential
B、powerful
C、monstrous
D、rigorous

答案B

解析 (powerful效力大的)。句意为:我们专门研究一种强效药,药力能够改变大脑的化学性质。A.influential有影响力的;C.monstrous巨大的,畸形的;D.rigorous严格的,严密的。
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