单项选择题

Why has the woman brought up the subject of snowflakes

A．She has never seen snow before.
B．She is conducting research on snow.
C．She wants to make artificial snow.
D．She has been reading about snow.
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单项选择题
How many basic types of snowflakes are there
A．One.
B．Two.
C．Three.
D．Four.
单项选择题
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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