单项选择题

A．They lived in large groups.
B．They used sand as insulation.
C．They kept fires burning constantly,
D．They faced their homes toward the sourth.
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单项选择题
A．A sick friend.B．A math class.C．School policy.D．The man’s test.
A．A sick friend.
B．A math class.
C．School policy.
D．The man’s test.
单项选择题
A．They lived in caves.B．They traveled in groups.C．They had an advanced language.D．They ate mostly fruit.
A．They lived in caves.
B．They traveled in groups.
C．They had an advanced language.
D．They ate mostly fruit.
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