单项选择题

Which of the following is true according to what you"ve heard

A．To make exchanges easier, prices should be fixed.
B．To make exchanges easier, a common money unit is used.
C．To make exchanges easier, the quality of goods must be good.
D．To make exchanges easier, a certain place must be provided.

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C．Demand of goods and service.
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What determines the use of resources and distribution o...

单项选择题What determines the use of resources and distribution of products

A．Price.
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填空题