单项选择题

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.
According to the new theory, where did ocean water come from

A．Disintegrating comets.
B．Gases in the atmosphere.
C．Underground water that rose to the surface.
D．Water vapor.

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单项选择题

单项选择题

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. According to the new theory, where did ocean water come from 您的浏览器不支持 audio 元素。