◎ 题干
At times the balance in nature is ________, resulting in a number of possibly unforeseen effects.
[     ]
A.troubled  
B.confused
C.disturbed  
D.puzzled
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“At times the balance in nature is ________, resulting in a number of possibly unforeseen effects.[ ]A.troubledB.confusedC.disturbedD.puzzled…”主要考查了你对  【动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。