单项选择题

What does this passage mainly discuss

A．The scarcity of manufactured goods.
B．The value of scarce materials.
C．The manufacturing of scarce goods.
D．The cost of producing shoes.
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单项选择题
According to the passage, what is the relationship between production and resources
A．Available resources stimulate production.
B．Resources are totally independent of production.
C．Production increases as resources increase.
D．Production lessens the amount of available resources.
单项选择题
According to the passage, what are the opportunity costs of an item
A．The amount of time and money spent in producing it.
B．The opportunities a person has to buy it.
C．The value of what could have been produced instead.
D．The value of the resources used in its production.
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