单项选择题

The Zip Code, the numerical system, was publicized in ______.

A．1943.
B．1963.
C．1974.
D．not know.
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单项选择题
The Zip Code system is used so as to ______.
A．read addresses quickly.
B．handle mail by machines.
C．sort out mail very fast.
D．do all of the above.
单项选择题
From the passage we may infer that the smallest delivery unit in the postal system in U. S.
A．is a ______.A. a state.
B．delivery station.
C．a geographical area.
D．metropolitan post office.
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