单选题Most people would be (21) by the high quality of medicine (22) to most Americans. There is a lot of specialization, a great deal of (23) to the individual, a (24) amount of advanced technical equipment, and (25) effort not to make mistakes because of the financial risk which doctors and hospitals must (26) in the courts if they (27) things badly. But the Americans are in a mess. The problem is the way in (28) health care is organized and (29) . (30) to pubic belief it is not just a free competition system. The private system has been joined a large public system, because private care was simply not (31) the less fortunate and the elderly. But even with this huge public part of the system, (32) this year will eat up 84.5 billion dollars---more than 10 percent of the U.S. Budget--large number of Americans are left (33) . These include about half the 11 million unemployed and those who fail to meet the strict limits (34) income fixed by a government trying to make savings where it can. The basic problem, however, is that there is no central control (35) the health system. There is no (36) 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 toothache, a sick child, or a heart attack, all the unfortunate persons concerned can do is (37) up. Two thirds of the population (38) covered by medical insurance. Doctors charge as much as they want (39) 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 1981 the country's health bill climbed 15.9 percent--about twice as fast as prices (40) general.

单选题The healing power of maggots is not new. Human beings have discovered it several times. The Maya are said to have used maggots for therapeutic purposes a thousand years ago. As early as the sixteenth century, European doctors noticed that soldiers with maggot-infested wounds healed well. More recently, doctors have realized that maggots can be cheaper and more effective than drugs in some respects, and these squirming larvae have, at times, enjoyed a quiet medical renaissance. The problem may have more to do with the weak stomachs of those using them than with good science. The modern heyday of maggot therapy began during World War Ⅰ, when an American doctor named William Bayer was shocked to notice that two soldiers who had lain on a battlefield for a week while their abdominal would became infested with thousands of maggots, had recovered better than wounded men treated in the military hospital. After the war, Bayer proved to the medical establishment that maggots could cure some of the toughest infections. In the 1930s hundreds of hospitals used maggot therapy. Maggot therapy requires the right kind of larvae. Only the maggots of blowflies (a family that includes common bluebottles and green bottles) will do the job; they devour dead tissue, whether in an open wound or in a corpse. Some other maggots, on the other hand, such as those of the screwworm eat live tissue. They must be avoided. When blowfly eggs hatch in a patient's wound, the maggots eat the dead flesh where gangrene-causing bacteria thrive. They also excrete compounds that are lethal to bacteria they don't happen to swallow. Meanwhile, they ignore live flesh, and in fact, give it a gentle growth-stimulating massage simply by crawling over it. When they metamorphose into flies, they leave without a trace—although in the process, they might upset the hospital staff as they squirm around in a live patient. When sulfa drugs, the first antibiotics, emerged around the time of World War Ⅱ, maggot therapy quickly faded into obscurity.

单选题What is the root cause of serious social disturbance in less developed countries?

单选题The rate at which man has been storing up useful knowledge about himself and the universe has been spiraling upward for 10,000 years. The (21) took a sharp upward leap with the invention of writing, but even (22) it remained painfully slow over centuries of time. The next great leap forward (23) knowledge acquisition did not occur (24) the invention of movable type in the 15th century by Gutenberg and others. (25) to 1500, by the most optimistic (26) Europe was producing books at a rate of 1,000 titles per year. This means that it (27) a full century to produce a library of 100,000 titles. By 1950, four and a half (28) later, the rate had accelerated so sharply that Europe was producing 120,000 titles a year. (29) once took a century now took only ten months. By 1960, a (30) decade later, the rate had made another significant jump, (31) a century's work could be completed in seven and a half months. (32) , by the mid-sixties, the output of books on a world (33) , Europe included, approached the prodigious figure of 900 titles per day. One can (34) argue that every book is a net gain for the advancement of knowledge. Nevertheless we find that the accelerative (35) in book publication does, in fact, crudely (36) the rate at which man discovered new knowledge. For example, prior to Gutenberg (37) 11 chemical elements were known. Antimony the 12th, was discovered (38) about the time he was working on his invention. It was fully 200 years since the 11th, arsenic, had been discovered. (39) the same rate of discovery continued, we would by now have added only two or three additional elements to the periodic table since Gutenberg. (40) , in the 450 years after his time, some seventy additional elements were discovered. And since 1900 we have been isolating the remaining elements not at a rate of one every two centuries, but of one every three years.

单选题Which of the following line is from the US official national anthem?

单选题The Romans used to sell by auction______.

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单选题My parents, my aunt and my uncle ______ gave me a present on my birthday. [A] each [B] every [C] either

单选题On the night of the play, Albert was at the hall early and he was already made-up long before the end of the first act. He certainly looked the part all right, he thought as he (21) himself (22) the mirror. He even (23) if he should go out into the street to see what (24) he made on people out there. Just for a (25) , of course! Then he was seized with a sudden attack of stage fright. How could he (26) all those people (27) the audience? He put his head in his hands and tried to (28) his lines. He had only a very small part, but his mind was a complete (29) A (30) on the door made him (31) . He felt really alarmed. He was due to go to stage in the second act. Had he missed his entrance and (32) the play for everybody? But it was only the producer, who noitced what a state he was in. She (33) he should go and stand near the stage where he could watch the play and follow in his script at the same time. It was a good way of getting (34) his nervousness, she said. She was right. It seemed to (35) . In fact, the more he watched the play, the more he became involved in it, so that he began to (36) himself part of it. At last the moment came for him to go on stage. But suddenly the producer was by his (37) again. This time she looked worried as she placed a hand on his arm to restrain him (38) . "I'm afraid you're going (39) ," She said. "They're jumped three pages of the script and have (40) your part out completely./

单选题What'sthemaintopicofthispassage?A.Thetestsofnewairlinerbeforeitsflying.B.Howtoprotectanewairliner?C.Howtotrainanewpilot?D.Whattheairlinerengineersshoulddo?

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单选题The word" controversy" (Line 4, Para. 4) probably means______.

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