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
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单项选择题
Which is NOT the right word used to describe Xinhua bookstore
A．Largest.
B．Official.
C．Private.
D．Prosperous.
单项选择题
Which of the following is NOT TRUE according to the passage
A．Human population expands at a straight upward trend.
B．Population growth has shown ups and downs 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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