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 second digit in the Zip Code identifies ______.
A．two or three states.
B．a part of populous states.
C．a state.
D．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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