At times the balance in nature is ______，resulting in a number of possibly unforeseen effects.
A．troubledB．confusedC．disturbedD．puzzled
C
trouble“麻煩，添麻煩”；confuse“使困惑”；puzzle“迷惑”；disturb“打亂，擾亂”。句意：有時(shí)候，自然界的平衡被打亂了，導(dǎo)致了無法預(yù)料的后果。所以C項(xiàng)正確。
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