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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单项选择题
Using money as a medium of exchange means that _________.
A．you have to sell something in order to buy something
B．you have to buy something in order to sell something
C．you don't have to buy something in order to sell something
D．the seller and the purchaser are the same person
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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