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.

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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.

单项选择题

It can be inferred from the passage that many Americans find it difficult to （）

A．build a house
B．find a ready-made house
C．have a good job
D．buy a house