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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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
单项选择题
According to the passage, a barter economy can lead to _________________.
A．rapid speed of transaction
B．inflation
C．misunderstandings
D．difficulties for the traders
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