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

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热门试题

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.