单项选择题

In the second paragraph, the word "real" in real goods could be replaced by _______.

A．high guality
B．concrete
C．utter
D．authentic
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单项选择题
According to the passage, a barter economy can lead to_______.
A．rapid speed of transaction
B．misunderstandings
C．inflation
D．difficulties for the traders
单项选择题
Which of the following is NOT mentioned by the author as a criterion(标准) for determining a person's place in a traditional society
A．Family background.
B．Age.
C．Religious beliefs.
D．Customs.
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