单项选择题


A．and
B．although
C．but
D．if
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单项选择题
A．orB．butC．soD．and
A．or
B．but
C．so
D．and
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.
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