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
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.
单项选择题
Which of the following can be inferred about the cultivated grass mentioned in the second paragraph
A．Cattle raised in the eastern United States refused to eat it.
B．It would probably not grow in the western United States.
C．It had to be imported into the United States.
D．It was difficult for cattle to digest.
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