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 south.
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单项选择题
A．They tend to stay within shouting or running distance of their parents.B．They should be aware of the potential risks in the playground.C．They may panic in front of high playground equipment.D．They can be creative when they feel secure.
A．They tend to stay within shouting or running distance of their parents.
B．They should be aware of the potential risks in the playground.
C．They may panic in front of high playground equipment.
D．They can be creative when they feel secure.
单项选择题
A．The man has to take it back home.B．The man will get a refund.C．The player will be repaired.D．The player will be put under guarantee.
A．The man has to take it back home.
B．The man will get a refund.
C．The player will be repaired.
D．The player will be put under guarantee.
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