单项选择题

By the concrete being too "green", the author means that the concrete has

A．become cracked.
B．not yet cured.
C．not dried out.
D．not settled in place.
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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.
单项选择题
In 1863 the United States government began providing which of the following to mail carriers
A．Housing.
B．A salary.
C．Transportation.
D．Free postage stamps.
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