题目内容

of windows as described in the first two paragraphs？
A Windows can change from clear to dark to save energy.
B Windows help to save energy by letting light in.
C Windows help to save energy by providing heat.
D Windows enable people to have contact with the outside world.

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？
A In the cold winter.
B In the hot summer.
C When air conditioners are turned on.
D Both A and B.

？
A Electricity.
B Tungsten oxide.
C A battery.
D A voltage.

，according to the last paragraph？
A The buildings will look different.
B Windows can be as large as you want.
C We may not need air conditioners any more.
D They are less expensive than traditional windows.

switch语句后括号里的表达式是什么类型？case后类型如何确定？