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单项选择题
A．By staying in their animal skin houses.B．By making their homes facing south.C．By bathing themselves in the sun.D．By burning trees.
A．By staying in their animal skin houses.
B．By making their homes facing south.
C．By bathing themselves in the sun.
D．By burning trees.
单项选择题
A．In modern roads.B．In modern buildings.C．In kitchen.D．In experimenting lab.
A．In modern roads.
B．In modern buildings.
C．In kitchen.
D．In experimenting lab.
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