Our research has focused on a drug which is so ______ as to be able to change brain chemis
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Our research has focused on a drug which is so ______ as to be able to change brain chemistry.
A．influential
B．powerful
C．monstrous
D．rigorous
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正确答案：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。