单项选择题

In the second paragraph, the word "real" in "real goods" could best be replaced by which of the following

A．High quality.
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 transactions
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 for determining a person's place in a traditional society
A．Family background.
B．Age.
C．Religious belief.
D．Custom.
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