单项选择题

A．An auto mechanic.
B．An electrician.
C．A carpenter.
D．A telephone repairman.
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单项选择题
In developed economies, service industries______.
A．tend to employ an increasing number of people
B．cause problems for the white-collar unions
C．employ more people than manufacturing industries do
D．try to reduce their employees and to combat rising costs
单项选择题
The author suggests that economics is concerned with______.
A．explaining to bankers the consequences of price changes
B．giving the same financial considerations as banking
C．trying to understand why some prices rise faster than others
D．understanding the effect of relative price changes
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