单项选择题

A. 500 million.
B. 600 million.
C. 700 million.
D. 800 million.
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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.
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.
单项选择题
A. Now he understands the system. B. He has no use for technology. C. He has to do some calculations. D. He doesn’t know how to operate the computer.
A. Now he understands the system.
B. He has no use for technology.
C. He has to do some calculations.
D. He doesn’t know how to operate the computer.
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