单选题
The natural balance between prey and predator has been increasingly______, most frequently by human intervention.
A、
celebrated
B、
predicted
C、
observed
D、
disturbed
【正确答案】
D
【答案解析】
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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