单项选择题

In die 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
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
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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