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.
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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.
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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