单项选择题

Why does the author mention both Boston and Chicago

A．To demonstrate positive and negative effects of growth.
B．To show that mass transit changed many cities.
C．To exemplify cities with and without mass transportation.
D．To contrast their rates of growth.

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单项选择题

The best title for the passage would be______.

A．The Wealth of a Country
B．The Standard of Living
C．The Natural Resources of a Country
D．none of the above

单项选择题

Which of the following about Britain's wealth is TRUE according to the passage

A．Britain's wealth is entirely produced and consumed within its borders.
B．Britain is more dependent upon trade than any other countries in the world.
C．Britain manufactures more than it needs for home consumption.
D．Britain's wealth lies only in what it can manufacture.