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 building materials are very expensive.
C．Construction time is increased.
D．Extra air- conditioning equipment is needed.

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单项选择题

Which of the following statements best describes the organization of the third paragraph of the passage

A．Two contrasting views of a problem are presented.
B．Recent scientific advancements are outlined in order of importance.
C．A procedure is explained and its importance is emphasized.
D．A problem is examined and possible solutions are given.

单项选择题

According to the passage, which aspect of skyscrapers were some residents of Boston concerned with in the late 1960's

A．The poor reception of radio and TV signals.
B．The removal of trees and grass from building sites.
C．The harmful effects on the city's plants.
D．The obstruction of air traffic.

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