While some bacteria are beneficial, others are ______in that they cause disease.

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问题 While some bacteria are beneficial, others are ______in that they cause disease.

选项 A、detrimental
B、prodigious
C、intrusive
D、mordant

答案A

解析 detrimental有害的，不利的；prodigious很大的，奇特的；intrusive冒昧闯入的；mordant飙刺的，尖酸的。根据句式while some…others判断，应选择beneficial的反义词，故选A。

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