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 句子的大意为：然而，自然界的这种平衡有时会被打乱，这将造成许多可能无法预料的后果。A项troubled“麻烦”；B项disturbed“弄乱，打扰，妨碍，使不安”；C项confused“(人)困惑”；D项puzzled“迷惑”。所以B项符合题意。
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