单项选择题

What can be concluded when the current tide of knowledge revolution ebbs

A．Productivity will rise.
B．Productivity will receive no impact.
C．Population growth will slow down.
D．Population growth will become accelerated.
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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.
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
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