单项选择题

What does the passage mainly discuss

A．The increased use of private mail services.
B．The development of a government postal system.
C．A comparison of urban and rural postal services.
D．The history of postage stamps.

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单项选择题

The private postal services of the nineteenth century claimed that they could do which of the following better than the government

A．Deliver a higher volume of mail.
B．Deliver mail more cheaply.
C．Deliver mail faster.
D．Deliver mail to rural areas.

单项选择题

The word they in the second paragraph, the fifth sentence means ______.

A．Boston and Philadelphia
B．businesses
C．arrangements
D．letters