◎ 题干
The balance of nature is _____ at times, resulting in a number of possibly unforeseen effects.

A. confused
B. troubled
C. disturbed
D. harmed
◎ 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“The balance of nature is _____ at times, resulting in a number of possibly unforeseen effects. [ ]A. confused B. troubled C. disturbed D. harmed …”主要考查了你对  【过去分词】  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。