单项选择题

How many significant demographic changes ever occurred in the past one million years

A．One.
B．Two.
C．Three.
D．None.
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单项选择题
According to this selection, the keys to social development and material progress are ___________.
A．profits and power
B．land and natural resources
C．science and education
D．industry and technology
单项选择题
The most appropriate title for this selection would be ___________.
A．The Development of a Materialistic Society
B．Science and Technology
C．Science for Self-Reliance
D．Natural Resources
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