单项选择题

Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the conversation.
What determines the shape of snowflakes

A．The shape of dust particles in the air.
B．The relative humidity.
C．The temperature of the air.
D．The geography of the area.

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单项选择题

单项选择题

Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. What determines the shape of snowflakes 您的浏览器不支持 audio 元素。