单项选择题

China is one of the few countries in the world that have devoted great efforts to________ world peace.

A．preserving
B．conserving
C．possessing
D．reserving
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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.
单项选择题
Which of the following was seen as a disadvantage of the postage stamp
A．It was very easy to counterfeit.
B．It increased the cost of mail delivery.
C．It was difficult to affix to letters.
D．It had to be purchased by the sender in advance.
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