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 (可信的).

单项选择题

What is the main purpose of the passage（）

A．To outline contrasting types of economic system.
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.