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At times the balance in nature is____, resulting in a number of possibly unforeseen effects.
A.confusedB.puzzledC.disturbedD.troubled
C

试题分析:句意:大自然之间的平衡不时地受到干扰,导致了很多无法预料的后果。A.困惑,迷惑  B. 困惑的,茫然的   C. 扰乱,干扰   D. 麻烦的,不安的。由句意可知选C。
点评:本题难度较小,只要平时对于单词的记忆够牢固,并能正确理解句子的句意,问题就迎刃而解了。
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