单项选择题

The word "superfluous" (Para. 3) most probably means ______.

A．indispensable
B．available
C．surplus
D．supplementary
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单项选择题
Which of the following is NOT mentioned by the author as a criterion for determining a person's place in a traditional society
A．Family background.
B．Age.
C．Religious belief.
D．Custom.
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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