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
An addict cannot continue his education or work at a job, because of ______.
A．his concentration on getting drugs
B．his personality
C．his emotional problems
D．his shortage of money
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