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.
The geologists’ research indicates that

A．comets contain no water.
B．comets contain little water.
C．comets water can’t form rain.
D．comets water can’t form enough rain.

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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. The geologists’ research indicates that 您的浏览器不支持 audio 元素。