What does Professor Libbrecht believe to be true? What do the simplest snow crystals look like?

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问题 What does Professor Libbrecht believe to be true?
What do the simplest snow crystals look like?

选项 A、They have six columns.
B、They are flaky.
C、They are cubic in shape.
D、They are six-sided.

答案D

解析第二段的第二句、第三句提供了答案。

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