If the balance of nature is , a series of problems will arise . A. disturbed B. troubledC

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(答案→)A. disturbed
B. troubled
C. interrupted
D. confused
解析：考查动词辨析：A. disturbed打扰，打断B. troubled困扰，麻烦C. interrupted打断D. confused困惑，句意：如果自然的平衡被打乱，一系列问题就会出现。选A。