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  3. In the late 1960s’, many people in North America turned their attention to environmental problems, and new steel-and-glass skysc

In the late 1960s’, many people in North America turned their attention to environmental problems, and new steel-and-glass skysc

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问题     In the late 1960s’, many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized. (36)______ pointed out that a cluster of tall buildings in a city often (37)______ public transportation and parking lot (38)______.
    Skyscrapers are also extravagant (39)______, and wasters, of electric power. In one recent year, the (40)______ of 17 million square feet of skyscraper office in New York city raised the (41)______ daily demand for electricity by 120 000 kilowatts—enough to supply the entire city of Albany, New York, for a day. Glass walled skyscrapers can be especially wasteful. The heat loss through a wall of half-inch plate glass is more than ten times that through a typical stone wall filled with (42)______ board. To lessen the strain on heating and air-conditioning (43)______,builders of skyscrapers have begun to use special glass that reduce glare as well as heat gain. (44)____________.
    On top of raising the temperature of the atmosphere, skyscrapers put a severe strain on a city’s sanitation facilities, too. (45)____________—as much as a city the size of Stamford, Connecticut, which has a population of more than 109 000.
    (46)____________. In Boston in the late 1960’s, some people even feared that shadows from skyscrapers would kill the grass on Boston Common. Still, people continue to build skyscrapers for all the reasons that they have always built them—personal ambition and the desire of owners to have the largest possible amount of rentable space.

  
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答案If fully occupied, the two World Trade Center towers in New York City would alone generate 2.25 million gallons of raw waste each year
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