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
What is found to have close relationship with rapid increase in population
A．War between 2 countries.
B．Ways discovered to increase productivity.
C．Migration from a continent to another continent.
D．A new religion beginning to be accepted by people.
单项选择题
What is the concept most people have on population growth
A．The population is always in constant geometric growth.
B．Rapid growth is followed by stable growth.
C．Decelerated growth is following by a decline.
D．No growth at all.
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