Most people would be【71】by the high quality of medicine【72】to most Americans. There is a lot of specialization, a great deal of【

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问题     Most people would be【71】by the high quality of medicine【72】to most Americans. There is a lot of specialization, a great deal of【73】to the individual, a【74】amount of advanced technical equipment, and【75】effort not to make mistakes because of the financial risk which doctors and hospitals must【76】in the courts if they【77】things badly.
    But the Americans are in a mess. The problem is the way in【78】health care is organized and【79】.【80】to pubic belief it is not just a free competition system. The private system has been joined by a large public system, because private care wag simply not【81】the less fortunate and the elderly.
    But even with this huge public part of the system,【82】this year will eat up 84.5 billion dollars—more than 10 percent of the U. S. budget, large numbers of Americans are left【83】. These include about half the 11 million unemployed and those who fail to meet the strict limits【84】income fixed by a government trying to save where it can.
    The basic problem, however, is that there is no central control【85】the health system. There is no【86】to what doctors and hospitals charge for their services, other than what the public is able to pay. The number of doctors has shot up and prices have climbed. When faced with a toothache, a sick child, or a heart attack, all the unfortunate persons concerned can do is【87】up. Two thirds of the population【88】covered by medical insurance. Doctors charge as much as they want【89】that the insurance company will pay the bill.
    The rising cost of medicine in the U. S. A. is among the most worrying problems facing the country. In 198l the Country’s health bill climbed 15.9 percent—about twice as fast as prices【90】general.

选项 A、is being
B、are
C、have been
D、is

答案B

解析 语法题。本句中的主语Two thirds of the population应视为复数,讲述的是一般事实,故用一般现在时态,故选项B are正确。句意:2/3的美国人参加了医疗保险。
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