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
单项选择题
How many advantages of money are mentioned in this passage
A．Two
B．Three
C．Four
D．Five
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