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、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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