单项选择题

An example of' product in monopolistic competition is ______ .

A．corn
B．electricity
C．airline tickets
D．coffee
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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 it in paragraph 3 refers to ______ .
A．a product or service
B．competition
C．revenue
D．oligopoly
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