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、powerful
B、influential
C、monstrous
D、vigorous

答案A

解析各项的意思是：powerful强大的；influential有影响的；monstrous畸形的；vigorous精力旺盛的。此空格的意思是：如此强大，以至于能够改变大脑化学物质。根据句意可知，应选择A。

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