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、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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