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

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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.

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.