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单项选择题

Which of the following periods saw people develop a more communal form of living

A．Paleolithic.
B．Ice Age.
C．Mesolithic.
D．Neolithi

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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.

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 are