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A. The Organization of An ArticleB. Check Your Reading SpeedC. A Way to Increase Your Reading SpeedD. Check Your UnderstandingE. Read Something Every DayF. Read Extensively Paragraph 3 ______
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Human Heart Can Make New Cells Solving a longstanding mystery, scientists have found that the human heart continues to generate new cardiac cells throughout the life span, although the rate of new cell production slows with age. The finding, published in the April 3 issue of Science, could open a new path for the treatment of heart diseases such as heart failure and heart attack, experts say. "We find that the beating cells in the heart, cardiomyocytes, are renewed," said lead researcher Dr. Jonas Frisen, a professor of stem cell research at the Karolinska Institute in Stockholm, Sweden. "It has previously not been known whether we were limited to the cardiomyocytes we are born with or if they could be renewed," he said. The process of renewing these ceils changes over time, Frisen added. In a 20-year-old, about 1 percent of cardiomyocytes are exchanged each year, but the turnover rate decreases with age to only 0.45 percent by age 75. "If we can understand how the generation of new cardiomyocytes is regulated, it may potentially possible to develop pharmaceuticals that promote this process to stimulate regeneration after, for example, a heart attack," Frisen said. That could lead to treatment that helps restore damaged hearts. "A lot of people suffer from chronic heart failure," noted co-author Dr. Ratan Bhardwaj, also from the Karolinska Institute. "Chronic heart failure arises from heart cells dying," he said. With this finding, scientists are "opening the door to potential therapies to having ourselves heal ourselves," Bhardwaj said. "Maybe one could devise a pharmaceutical agent that would make heart cells make new and more cells to overcome the problem they are facing." But barriers remain. According to Bhardwaj, scientists do not yet know how to increase heart cell production to a rate that would replace cells faster than they are dying off, especially in older patients with heart failure. In addition, the number of new cells the heart produces was estimated using healthy hearts--whether the rate of cell turnover in diseased hearts is the same remains unknown. Chronic heart failure is associated with ______.
Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near-starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical School in Boston, U.S., and his colleagues have been able to extend the lifespan (寿命) of mice by 18 per cent by blocking the rodent’s (啮齿动物) increase of fat in specific cells. This suggests that thinness--and not necessarily diet--promotes long life in "calorie (热量卡) restricted" animals. "It’s very cool work," says aging researcher Cynthia Kenyon of the University of California, San Francisco. "These mice eat all they want, lose weight and live longer. It’s like heaven." Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown partly because few people are willing to submit to such a strict diet. But many researchers hope they will be able to trigger the same effect with a drug once they understand how less food leads to a longer life. One theory is that eating less reduces the increase of harmful things that can damage cells. But Kahn’s team wondered whether the animals simply benefit by becoming thin. To find out, they used biology tricks to disrupt the insulin (胰岛素) receptor (受体) gene in lab mice, but only in their fat cells. "Since insulin is needed to help fat cells store fat, these animals were protected against becoming fat," explains Kahn. This slight genetic change in a single tissue had dramatic effects. By three months of age, Kahn’s modified mice had up to 70 per cent less body fat than normal control mice, despite the fact that they ate 55 per cent more food per gram of body weight. In addition, their lifespan increased. The average control mouse lived 753 days, while the thin rodents averaged a lifespan of 887 days. After three years, all the control mice had died, but one-quarter of the modified rodents were still alive. "That they get these effects by just manipulating the fat cells is controversial," says Leonard Guarente of the Massachusetts Institute of Technology, who studies calorie restriction and aging. But Guarente says Kahn has yet to prove that the same effect is responsible for increased lifespan in calorie-restricted animals. "It might be the same effect or there might be two routes to long life," he points out, "and that would be very interesting.\ According to the passage, we do not know whether humans will benefit from taking in fewer calories partly because ______.
Florence Nightingale In 1837, to the age of seventeen, Florence Nightingale decided to become a nurse, (51) horrified her dear mother. In (52) days, nurses were little more than doormen, and hospitals were places of dirtiness and (53) . Nightingale pressed on and in 1853 she became president (54) a small London hospital. She went on to the Crimea when war (55) there between Britain and Russia. She (56) the first of what we now know (57) war hospitals: sanitary. safe, and stocked with supplies. Her tireless ministrations (照料) to the (58) soldiers made her famous all (59) the world. Following the War, Nightingale (60) fame and continued to train nurse, ever battling (61) what she herself declared "a commonly received idea...that it requires nothing (62) a disappointment in love, or incapacity in other things, to turn a woman (63) a good nurse." Since 1921, her birthday (64) the centerpiece of National Hospital Week, (65) in British and American hospitals with special exhibitions, workshops, and publicity drives.
In common with many countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government 【26】 new laws to stop smog from coal fires and factories and the 【27】 improved a lot. Today, London is much cleaner 【28】 there is a new problem: smog from cars. In December 1991, there was very 【29】 wind in London and pollution 【30】 a lot, which led to 160 deaths in just four days. 【31】 of the problem is the new "out of town" shopping centers. In the past, people often【32】 to shops near their homes or went by bus. Today, many people drive to the new shopping centers. 【33】, the small shops have 【34】 and more people have to go a long way to 【35】 their shopping. Critics say that Britain needs better and cheaper public 【36】. Many people are trying to【37】 the use of cars in Britain. Some cities now have special bicycle 【38】 and many people ride to work. Some people also 【39】 to work together in one car to reduce the pollution and the 【40】. Sometimes people take " direct 【41】 ". In 1995, for example, many people wanted to 【42】 a new road near Newbury. They built houses 【43】 trees and lived there for many months. It 【44】 a long time to force the people out of the trees 【45】 work on the road could continue.
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