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．Neolithic.
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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
How many basic types of snowflakes are there
A．One.
B．Two.
C．Three.
D．Four.
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