2. 外语
  3. Although plant and animal species that become established in ecosystems where they did not originate are sometimes referred to b

Although plant and animal species that become established in ecosystems where they did not originate are sometimes referred to b

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问题 Although plant and animal species that become established in ecosystems where they did not originate are sometimes referred to by the alarming term "invasive species," many such species are______in their new environments.
选项
答案A
解析 The sentence begins with "Although," indicating that the correct answer will contrast in tone with the "alarming term ’invasive species.’" The only answer choice that provides the necessary contrast is "innocuous." All the other choices are consistent with being alarming.
    Thus, the correct answer is innocuous(Choice A).
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