单项选择题

The elapsed time of the fastest transatlantic crossing mentioned by the author was 13 days and （）

A．11.5 hours
B．7.5 hours
C．7 hours
D．4.5 hours

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单项选择题

The fastest transatlantic voyage by a packet mentioned by the author was from（）

A．Liverpool to New York
B．New York to Liverpool
C．Liverpool to Baltimore
D．Baltimore to Liverpool

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.