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 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
Another advantage in building down rather than up is that ______.
A．surface constructions then can be more aesthetically planned
B．historic landmarks then can be better preserved.
C．there won't be skyscrapers blocking our view.
D．there will be more green land left untouched.
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