单项选择题

Which of the following groups would be most concerned with the issues raised by the author

A．Electricians.
B．Environmentalists.
C．Aviators.
D．Teachers.
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单项选择题
Where in the passage does the author compare the energy consumption of skyscrapers with that of a city
A．Para. 2
B．Para. 4
C．Para. 3
D．Para. 5
单项选择题
According to the passage, what is one disadvantage of skyscrapers that have mirrored walls
A．The exterior surrounding air is heated.
B．The windows mast be cleaned daily.
C．Construction time is increased.
D．Extra air-conditioning equipment is needed.
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