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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


解析:

trouble主要指遇上難解決的問題而使人苦惱、憂慮;puzzled  指人是困惑的,因此將A、D兩項排除;根據句意,自然的平衡本身并不是混亂的(confused),而不受到了人為的干擾(disturbed),才會導致不可預見的影響。因此選擇C項。  

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