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(xiàng)排除；根據(jù)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(dǎo)致不可預(yù)見的影響。因此選擇C項(xiàng)。

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