单项选择题

Which of the following was seen as a disadvantage of the postage stamp

A．It had to be purchased by the sender in advance.
B．It increased the cost of mail delivery.
C．It was difficult to affix to letters.
D．It was easy to counterfeit.

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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