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

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

 

C

trouble主要指遇上难解决的问题而使人苦恼、忧虑;puzzled 指人是困惑的,因此将A、D两项排除;根据句意,自然的平衡本身并不是混乱的(confused),而不受到了人为的干扰(disturbed),才会导致不可预见的影响。

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