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

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.

单项选择题

What can be inferred by the phrase Legend has it in line 1

A．The story of the train may not be completely factual.
B．Most history books include the story of the train.
C．The driver of the train invented the story.
D．The story of the train is similar to other ones from that time period.