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问题

The passage suggests that oxygen remained in the atmosphere because ______.A.it was caused


The passage suggests that oxygen remained in the atmosphere because ______.

A.it was caused by outgassing

B.it was heavier than hydrogen

C.hydrogen became trapped in limestone

D.rays from the sun created equal amounts of hydrogen and oxygen ______.

请帮忙给出正确答案和分析,谢谢!

参考答案
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