However，at times this balance in nature is _______ resulting in a number of possibly unforeseen effects
A.troubledB.disturbedC.confusedD.puzzled在线课程B
词义辨析。A.麻烦； B.打乱； C.使困惑； D.使为难。句意：然而，有时自然平衡被打乱导致了大量可能无法预料的影响。故选B。
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