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
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.
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
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