题目内容

However，at times this balance in nature is _______ resulting in a number of possibly unforeseen effects.
A．troubled B．disturbedC．confusedD．puzzled
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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