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.
What determined the shape of the 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 are

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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. What determined the shape of the snowflakes 您的浏览器不支持 audio 元素。