However, at times this balance in nature is ______, resulting in a number of pos

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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、confused
C、disturbed
D、puzzled

答案 C

解析 disturb vt．打乱，弄乱；扰乱；打扰，使不安。trouble vt.使烦恼，使苦恼；麻烦，费神。confuse vt．使混乱，混淆。puzzle vt.(使)迷惑，(使)为难。

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