听力原文：How do snowflakes come into being?
(29)
A.Snow crystals may stick together to make a snowflakE.
B.Dusts may join together to form. a snowflakE.
C.Snowflakes is produced by snow storms.
D.Raindrops may freeze to form. snowflakes.

A.Snow
B.
B.Dusts
C.
C.Snowflakes
D.
D.Raindrops
E.

【参考答案】

A
解析：本题问“雪花是本样形成的?”短文提到，When snow crystals stick togethe......

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