填空题

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 killed 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.