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

单项选择题Where in the passage does the author compare the energy consumption of skyscrapers with that of a city

单项选择题The main purpose of the passage is to ______.

单项选择题According to the passage, what is one disadvantage of skyscrapers that have mirrored walls

单项选择题Tile author raises issues that would most concern which of the following groups

单项选择题The author mentions people dying of air pollution in ______.