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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单项选择题
The author talks about some American writers, who______.
A．wrote stories about American eating habits
B．decided to enjoy leisurely lunches
C．eat while they work
D．wrote short plays to be presented at fancy night Clubs
单项选择题
The author feels that Americans lack______.
A．understanding
B．self-confidence
C．a rebellious spirit
D．self-control
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