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 peopl

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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

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