Research shows that this pesticide is so ______ that it can kill the insects in

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问题 Research shows that this pesticide is so ______ that it can kill the insects in a few seconds.

选项 A、powerful
B、influential
C、monstrous
D、vigorous

答案 A

解析考查形容词辨析。四个选项中只有powerful意为“强效的”，可与表示药物的名词搭配。influential“有影响的，有势力的”；monstrous“巨大的”；vigorous“精力旺盛的，强健有力的”。

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