单项选择题

A．boring
B．short
C．meaningless
D．simple
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Under modern conditions ,this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research experts.
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in the early industrialized countries of Europe the process of industrialization-with all the far-reaching changes in social patterns that followed-was spread over nearly a century, whereas nowadays a developing nation may undergo the same process in a decade or so.
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