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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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
It is not boring inside Bennett's new building because ______.
A．there is a telewindow on the roof projecting the outside view.
B．there are lenses and mirrors on all floors.
C．there is an array of lenses reflecting sunlight.
D．both A andC.
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