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
In mentioning natural leaders in line 7, the author is making the point that ______.
A．few people qualify as "natural leaders"
B．there is no proof that "natural leaders" exist
C．"natural leaders" are easily accepted by the members of a group
D．"natural leaders" share a similar set of characteristics
单项选择题
What determines the price of a good in a market economy
A．The cost of all elements in production.
B．The cost of not making other goods.
C．The efficiency of the manufacturing process.
D．The quantity of materials supplied.
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