However，at times this balance in nature is _______ resulting in a number of possibly unforeseen effects


  1. A.
    troubled
  2. B.
    disturbed
  3. C.
    confused
  4. D.
    puzzled
B
詞義辨析。A.麻煩；  B.打亂；  C.使困惑；   D.使為難 。句意：然而，有時自然平衡被打亂導(dǎo)致了大量可能無法預(yù)料的影響。故選B。
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科目：高中英語 來源： 題型：閱讀理解

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A
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