However，at times this balance in nature is _______ resulting in a number of possibly unforeseen effects.
A．troubled B．disturbedC．confusedD．puzzled
B
詞義辨析。A.麻煩；  B.打亂；  C.使困惑；   D.使為難 。句意：然而，有時自然平衡被打亂導致了大量可能無法預料的影響。故選B。
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