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 must be cleaned daily.
C．Construction time is increased.
D．Extra air-conditioning equipment is needed.

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单项选择题

The author raises issues that would most concern which of the following groups

A．Electricians.
B．Environmentalists.
C．Aircraft pilots.
D．Teachers.

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．support the use of stone in the construction of skyscrapers
D．illustrate some architectural designs of skyscrapers