单选题：Our research has focused on a drug which is so______ as to b

题目内容：

Our research has focused on a drug which is so______ as to be able to change brain chemistry． A．powerful
B．influential
C．monstrous
D．vigorous

参考答案：

答案解析：

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请在第(46)处选择正确答案_______A．safe B．direct C．influential D．powerful

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