单项选择题

In the second paragraph, the word "real" in "real goods" could best be replaced by_________________.

A．high quality
B．concrete
C．utter
D．authentic
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单项选择题
According to the passage, _______________ has the greatest degree of control in an administered system.
A．individual households
B．major corporations
C．small businesses
D．the government
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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