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
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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
单项选择题
According to the passage, economics is______.
A．different from sciences such as medicine
B．similar to other social sciences because it is imprecise
C．similar to other social sciences because a lot of nonsense is talked about it
D．different from social sciences which try to forecast the way people behave
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