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．Give Simon a different office.B．Complain to the department head.C．Move the supplies to the storage room.D．Try to get a room to use for meetings.
A．Give Simon a different office.
B．Complain to the department head.
C．Move the supplies to the storage room.
D．Try to get a room to use for meetings.
单项选择题
Slightly less than a third of CO2 emissions in the United States are caused by deforestation.
A．Y
B．N
C．NG
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