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    t times the balance in nature is ______，resulting in a number of possibly unforeseen effects.

    A. troubled B. confused　 C. disturbed D. puzzled

     

    C

    trouble“麻烦，添麻烦”；confuse“使困惑”；puzzle“迷惑”；disturb“打乱，扰乱”。句意：有时候，自然界的平衡被打乱了，导致了无法预料的后果。所以C项正确。

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