单项选择题


A．given
B．order
C．reception
D．delivery
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单项选择题
A．introductionB．commentC．preparationD．conclusion
A．introduction
B．comment
C．preparation
D．conclusion
单项选择题
What does a new firm think about when it considers entering the market with a new product
A．Two external effects.
B．The externalities associated with entry.
C．The number of firms in the market.
D．The profit it would mak
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