7Which of the following is NOT true according to the passage? ( )
A. Skyscrapers provide more usable space than other buildings. B. The skyscrapers first appeared in the late 1960s. C. Where there are skyscrapers, television reception is poor. D. The two World Trade Center towers are skyscrapers.
9 According to the passage, which aspect of skyscrapers was some residents of Boston concerned with i
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.
10According 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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