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
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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
单项选择题
The author seems to suggest getting to know ____________ is critical to market success.
A．consumers' problems
B．consumers' motives
C．consumers' experience
D．consumers' needs
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