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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单项选择题
According to the passage, modern societies control supply and demand______.
A．by fixing prices in specific industries
B．by means of money and the price mechanism
C．by keeping a watchful eye on relative price changes
D．by direct intervention in the pricing of goods and services
单项选择题
In the author's view, the assertion that money would be useless on a desert island______.
A．illustrates one limitation to the importance of money
B．is only of importance to people stranded in some places
C．tells us nothing of interest or significance about money
D．proves that there are many situations in which money is irrelevant
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