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
Specialization is encouraged because _________.
A．people can use their money to buy whatever they want
B．people do not need to make a complete product for exchange
C．people make a great contribution to the manufacture of a product
D．people cannot use their money to buy whatever they want
单项选择题
Why does the auctioneer decide to sell the lots out of their numerical order.'
A．He wants to confuse some dealers and make them bid the highest price.
B．He can hold back certain goods until the interested dealers arrive.
C．He wants to keep certain people waiting in order to reduce the number of buyers.
D．He is sometimes bribed by certain dealers who want to buy certain articles cheap.
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