单项选择题

Which of the following was most important in the development of the fast packets（）

A．The increased demand for the transportation of all kinds of cargo.
B．The increase in the number of people who wanted to go to Europe after the war of 1812.
C．The increase in the number of people who wanted to go to America.
D．The increased volume of mail.

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单项选择题

The size of the Amity was about （）

A．250 tons
B．450 tons
C．650 tons
D．950 tons

单项选择题

Which of the following best describes the purpose of the passage（）

A．To show how American society has changed.
B．To compare two different ways of American life.
C．To tell the meaning of the American people's attitude towards life style.
D．To prove that modern life is better than the life in the past.