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 ______.

单项选择题Scientists are trying to find a link between pollution and ______.