单项选择题

A．The professor wasn’t present.
B．The professor put off it.
C．Too many students showed up.
D．He missed the class.
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单项选择题
A．To reduce the price.B．To gain market share.C．To reduce cost in manufacturing.D．To increase production
A．To reduce the price.
B．To gain market share.
C．To reduce cost in manufacturing.
D．To increase production
填空题
What does the author want to say by citing the examples of Paris, Venice and Florence
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