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 does the word domestic mean in Para. 2
A．Energetic.
B．Excited.
C．Alien.
D．Native.
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.
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