单项选择题

In the second paragraph, the word "real" in "real goods" could best be replaced by which of the following（）

A．High quality.
B．Concrete.
C．Utter.
D．Authentic (可信的).

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单项选择题

What is the main purpose of the passage（）

A．To outline contrasting types of economic system.
B．To explain the science of economics.
C．To argue for the superiority of one economic system.
D．To compare barter and money-exchange markets.

单项选择题

What is the main subject of the passage（）

A．The cost of having a house built.
B．The American dream of owning a house.
C．A description of owner-builder in America.
D．A comparison between young couples and their parents.