2. 外语
  3. However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.

However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.

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问题 However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.
选项 A、troubled
B、disturbed
C、confused
D、puzzled
答案B
解析 A项troubled意为“麻烦，困扰，打扰”；B项disturbed意为“打扰，打乱，打破”；C项confused意为“困惑，迷惑不解”；D项puzzled意为“迷惑，窘困”。根据句子主语部分this balance in nature(大自然的这种平衡)提示，应选B项。
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