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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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．authentic
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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