What is the main idea of the passage? [br] The passage suggests that oxygen rema

游客2024-01-05  31

问题 What is the main idea of the passage? [br] The passage suggests that oxygen remained in the atmosphere because ______.

选项 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 ______.

答案 B

解析
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