However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.

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问题 However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.

选项 A、troubled
B、disturbed
C、confused
D、puzzled

答案B

解析 A项troubled意为“麻烦,困扰,打扰”;B项disturbed意为“打扰,打乱,打破”;C项confused意为“困惑,迷惑不解”;D项puzzled意为“迷惑,窘困”。根据句子主语部分this balance in nature(大自然的这种平衡)提示,应选B项。
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