单项选择题

The word "it" in paragraph 3 refers to ______.

A．a product or service
B．competition
C．revenue
D．oligopoly
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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
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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