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、multiple
D、energetic

答案A

解析 powerful“有力的”,它可以指人或政党等权势很大的,还可指机器的功率大以及药品的药力大等;influential“有影响的;有势力的”,一般用来形容能够产生影响或有强大势力的人或事物;multiple“复合的;多样的”,如:a man of multiple interests“有多方面兴趣的人”;energetic“精神饱满的;精力充沛的”,一般用来形容人充满生机和活力。所以只有powerful才能用来形容drug。
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