单项选择题

The best title for this selection would be:________.

A．Concrete and Its Uses
B．Rules for Working with Concrete
C．Concrete, the Homeowner's Joy
D．Concrete, a Test of Character
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单项选择题
The author writes the passage to tell the reader that________.
A．the lack of adversity is a disadvantage
B．he envies the generation
C．America has now enjoyed peace and prosperity
D．the generation can join together and meet challenges
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.
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