单项选择题


A．or
B．but
C．so
D．and
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单项选择题
What is the concept most people rove 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.
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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