单项选择题

The passage is mainly about ______.

A．how American goods are produced
B．how American consumers buy their goods
C．how American economic system works.
D．how American businessmen make their profits.

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单项选择题

The first two sentences in the second paragraph tell us that ______.

A．producers can satisfy the consumers by mechanized production
B．consumers can express their demands through producers
C．producers decide the price of products
D．supply and demand regulate price