单项选择题

In Para. 1, "the desire of individuals to maximize their incomes" means ______.

A．Americans are never satisfied with their incomes
B．Americans tend to overstate their incomes
C．Americans want to have their incomes increased
D．Americans want to increase the purchasing power of their incomes
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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.
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
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