根据下列内容，回答201-205题。In the late 1960s, many people in North America turned their attention to environmentalproblems, and new steel-and-glass skyscrapers were widely criticized. Ecologists pointed out that acluster of tall buildings in a city often transportation and parking lot capacities.Skyscrapers are also lavish consumers, and wasters of electric power. In one recent year, theaddition of 17 million square feet of skyscraper office space in New York City raised the peak dailydemand for electricity by 120,000 kilowatts--enough to supply the entire city of Albany, NewYork, for a day.Glass-walled skyscrapers can be especially wasteful. The heat loss (or gain) through a wall ofhalf-inch plate glass is more than ten times that through a typical masonry wall filled with insula-tion board. To lessen the strain on heating and air-conditioning equipment, builders of skyscrapershave begun to use double-glazed panels of glass, and reflective glasses coated with silver or goldmirror films that reduce glare as well as heat gain. However, mirror-walled skyscrapers raise thetemperature of the surrounding air and affect neighboring buildings.Skyscrapers put a severe strain on a city's sanitation facilities, too. If fully occupied, the twoWorld Trade Center towers in New York City would alone generate 2.25 million gallons of rawsewage each year--as much as a city the size of Stamford, Connecticut, which has a population ofmore than 109,000.Skyscrapers also interfere with television reception, block bird flyways, and obstruct air traf-fic. In Boston in the late 1960s, some people even feared that shadows from skyscrapers would killthe grass on Boston Common.Still, people continue to build skyscrapers for all the reasons that they have always builtthem--personal ambition, civic pride, and the desire of owners to have the largest possible amountof rentable space.The main purpose of the passage is to__________.
A.discuss the advantages and disadvantages of skyscrapersB.compare skyscrapers with other modern structuresC.describe skyscrapers and their effect on the environmentD.illustrate various architectural

It can be inferred that a car accident is often coupled with__________.
A.a plastic surgeonB.a companionC.a riskD.a fire

根据下列内容，回答216-220题。The men who race the cars are generally small, with a tight, nervous look. They range fromthe early 20s to the middle 40s, and it is usually their nerves that go first.Fear is the driver's constant companion, and tragedy can be just a step behind. Scarcely a manin the 500 does not carry the scars of ancient crashes. The mark of the plastic surgeon is every-where, and burned skin is common. Sometimes a driver's scars are invisible, part of his heritage. Twoyoung drivers, Billy Vukovich and Gary Bettenhausen, raced in their first 500 in 1968. Less than 20years before, their fathers also competed against one another on the Indy track--and died there.All this the drivers accept. Over the years, they have learned to trust their own techniques,reflexes, and courage. They depend, too, on a trusted servant--scientific engineering. Though theymay not have had a great deal of schooling(an exception is New Zealand's Bruce McLaren, whohas an engineering degree), many drivers are gifted mechanics, with a feeling for their enginesthat amount to kinship.A few top drivers have become extremely wealthy, with six-figure incomes from prize money,endorsements, and jobs with auto-product manufacturers. Some have businesses of their own.McLaren designs racing chassis (底盘). Dan Gurney's California factory manufactured the chassisof three of the first four ears in the 1968 Indy 500, including his own second place car.Yet money is not the only reason why men race cars. Perhaps it isn't even the major reason.Three-time Indy winner (1961,1964,1967)
A. J. Foyt, for example, can frequently be foundcompeting on dirty tracks in minor-league races, where money, crowds and safety features are limit-ed, and only the danger is not. Why does he do it7Sometimes Foyt answers,"It's in my blood."Other times he says, "It is good practice." Now and then he replies, "Don't ask dumb questions." The statement "it is usually their nerves that go first" means
A.at first they all have a nervous lookB.they often find they can't bear the tension even if they are in good conditionC.someday they find they can't make responses to any riskD.they can continue their career at most until the middle 40s

According to the passage, what is one disadvantage of skyscrapers that have mirroredwalls?__________
A.The exterior surrounding air is heatedB.The building materials are very expensiveC.Construction time is increasedD.Extra air-conditioning equipment is needed

The invisible scars of the drivers mentioned in the second paragraph refers to__________.
A.the regrets left by their fathersB.the fears left by their fathersC.the cars left by their fathersD.the heritage left by their fathers

The passage is
A.NarrationB.ExpositionC.CriticismD.Argumentation