单选题：One of the main difficulties in accurate earthquake forecast

题目分类：综合类
题目类型：单选题
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题目内容：

One of the main difficulties in accurate earthquake forecasting is that__________. A．earthquakes may take place in anywhere possible
B．earthquakes take place simultaneously and unexpectedly
C．most earthquakes take place at any unexpected moment
D．the occurrence of earthquakes involves too many unforeseen factors

参考答案：

答案解析：

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分类：综合类题型：单选题