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
According to the passage, in the late 1960' s some residents of Boston were concerned with which aspect of skyscrapers
A．The noise from their construction.
B．The removal of trees from building sites.
C．The harmful effects on the city's grass.
D．The high cost of rentable office space.
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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