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．authenti
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单项选择题
According to the passage, who has the greatest degree of control in an administered system
A．Individual
B．Small businesses
C．Major corporations
D．The government
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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