单项选择题

In the passage, the author includes all of the following EXCEPT ______.

A．a business principle
B．a definition of productivity ....
C．an example of a successful company
D．an illustration of a process technology
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单项选择题
What problems has the space station experienced in the past six months
A．Generator malfunction.
B．Computer error.
C．A collision with another station.
D．All the above.
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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