单项选择题

A．The history of Benjamin Franklin.
B．The history of the U.S. mail.
C．The Changes of writing letters.
D．The history of U. S.
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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
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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