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
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.
单项选择题
Why are subterranean buildings good for energy conservation
A．Because they use solar energy.
B．Because they don't need central heating.
C．Because the temperature there remains constant.
D．Because they don't need air-conditioning.
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