单项选择题

What is the main purpose of the passage

A．To outline contrasting types of economic systems.
B．To explain the science of economics.
C．To argue for the superiority of one economic system.
D．To compare barter and money-exchange markets.
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单项选择题
Which of the following is NOT mentioned by the author as a criterion for determining a person's place in a traditional society
A．Family background.
B．Age.
C．Religious belief.
D．Custom.
单项选择题
According to the passage, a barter economy can lead to ______.
A．rapid speed of transactions
B．misunderstandings
C．inflation
D．difficulties for the traders
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