题目内容

At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects.
A．troubledB．confusedC．disturbedD．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。因此选择C项。
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