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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

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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.

单项选择题The main purpose of the passage is to______.

A．compare skyscrapers with other modem structures
B．describe skyscrapers and their effect on the environment
C．advocate the use of masonry in the construction of skyscrapers
D．illustrate some architectural designs of skyscrapers