2. 外语
  3. The natural balance between prey and predator has been increasingly______, most frequently by human intervention.

The natural balance between prey and predator has been increasingly______, most frequently by human intervention.

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问题 The natural balance between prey and predator has been increasingly______, most frequently by human intervention.
选项 A、celebrated
B、predicted
C、observed
D、disturbed
答案D
解析 A项celebrate“庆祝”；B项predict“预测”；C项observe“观察”；D项disturb“扰乱”。从句意可判断D正确。
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