单项选择题

Which of the following developments is NOT related to the condition of the Ice Age

A．Farming.
B．Clothing.
C．Living indoors.
D．Using fire.
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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．Neolithic.
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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