单项选择题

A barter economy is one in which ______.

A．value is decided by weight
B．value is decided by number
C．money is used and goods are not exchanged
D．goods are exchanged and money is not used
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单项选择题
If one had to save products instead of money, ______.
A．this would need years of practice
B．coal, for example, would lose its value
C．they could not be stored for years on end
D．many products would lose their value
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