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【单选题】

A、4.2 billion years ago.

B.3.3 billion years ago.

C.2.9 billion years ago.

D.1.2 billion years ago.

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根据网考网移动考试中心的统计,该试题:

23%的考友选择了A选项

72%的考友选择了B选项

0%的考友选择了C选项

5%的考友选择了D选项

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