At times the balance in nature is , resulting in a number of possibly unforeseen effects.
A. troubled
B. confused
C. disturbed
D. puzzled
网友回答
A. troubled
B. confused
(答案→)C. disturbed
D. puzzled
解析: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。