单项选择题

Questions 4 to 6 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Geologists believe that ocean water came from

A．comets.
B．raindrops.
C．volcanoes.
D．other planets.

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单项选择题

单项选择题

Questions 4 to 6 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Geologists believe that ocean water came from 您的浏览器不支持 audio 元素。