单项选择题

What does the passage mainly discuss

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

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单项选择题

Which of the following statements is NOT true

A．Anyone who wanted to build railroads could get some land.
B．"Land grant colleges" had land.
C．People moved to the new areas which had became states.
D．There were a lot of family farms after 1862.

单项选择题

The main theme of the passage is________.

A．the high college costs in the U. S.
B．how to get financial aid in a college
C．American higher education
D．college costs and financial aid