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.
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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 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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