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
The reason why even the best auctioneer cannot stop the knock-out is that _________.
A．he has been deeply involved in it
B．the dealers do not know the true value of the article
C．he is not familiar with the regular buyers of the goods
D．the dealers make the arrangement behind his back
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