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  3. What does Professor Libbrecht believe to be true? What are the factors that affect the shape and growth rate of a snow crystal?

What does Professor Libbrecht believe to be true? What are the factors that affect the shape and growth rate of a snow crystal?

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问题 What does Professor Libbrecht believe to be true?
What are the factors that affect the shape and growth rate of a snow crystal?
选项 A、Humidity and temperature.
B、Water and falling speed.
C、Air and altitude.
D、Both B and Ｃ.
答案A
解析 第三段第二句和第四句中提到了One factor is humidity... A second factor is air temperature。所以A是正确的答案。
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