单项选择题

Which of the following would be the best title for the passage

A．Monopolies
B．The Commodity Market
C．The Competition Continuum
D．The Best Type of Competition
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单项选择题
The word it in paragraph 3 refers to ______ .
A．a product or service
B．competition
C．revenue
D．oligopoly
单项选择题
The word tolerated in paragraph 4 could best be replaced by ______ .
A．permitted
B．reserved
C．criticized
D．devised
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