单项选择题

What does the passage mainly discuss

A．Western migration after the Civil War
B．The climate of the western United States
C．The raising of cattle
D．A type of wild vegetation
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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.
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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