单项选择题

If a country has a population of 20 million and its rate of natural population increase is 2%, after 34 years, the country will have a population of ______.

A．80 million
B．60 million
C．50 million
D．40 million
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It seems that some young scientists ______.
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In the passage, the author includes all of the following EXCEPT ______.
A．a business principle
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