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 accelerate
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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．Non
单项选择题
Which of the following is net true according to the passage
A．Human population expands at an exponential rate.
B．Population growth has shown fluctuation in demographic history.
C．Population growth can not be regarded as a social failure.
D．Increase in population is related to productivity.
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