2. 外语
  3. The environmental threat posed by the New Zealand mud snail, an invasive species, is________ by the snail’s small size, which fa

The environmental threat posed by the New Zealand mud snail, an invasive species, is________ by the snail’s small size, which fa

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问题 The environmental threat posed by the New Zealand mud snail, an invasive species, is________ by the snail’s small size, which facilitates its spread across watersheds through human activity.
A. initiated
B. ameliorated
C. exacerbated
D. extenuated
E. mitigated
F. aggravated
选项
答案C,F
解析 同义重复题。前面说入侵物种新西兰泥螺(mud snail)造成的环境威胁(threat)被这种螺的微小体积________，后面说人类活动促进了(facilitate)它的跨流域蔓延(its spread across watersheds)。空格处应该表达环境威胁被“扩大，加剧”了，C项exacerbated和F项aggravated符合语义。
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