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At times the balance in nature is ______,resulting in a number of possibly unforeseen effects.
A.troubledB.confusedC.disturbedD.puzzled
C
trouble“麻烦,添麻烦”;confuse“使困惑”;puzzle“迷惑”;disturb“打乱,扰乱”。句意:有时候,自然界的平衡被打乱了,导致了无法预料的后果。所以C项正确。
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