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Passage One What happens after cable television has moved into cities
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香附具有的药理作用是
Looking for a new weight loss plan Try living on top of a mountain. Mountain air contains less oxygen than air at lower altitudes, so breathing it causes the heart to beat faster and the body to burn more energy. A handful of studies have found that athletes training at high altitudes tend to lose weight. Doctor Florian Lippl of the University Hospital of Ludwig-Maximilians-University Munich wondered how the mountain air would affect overweight individuals if they weren’t doing any more physical activity than usual. Lippl and his colleagues invited 20 overweight men to an environmental research station about 300 meters below the summit of Zugspitze, a mountain around 2,970 meters near the Austrian border. They were allowed to eat as much as they liked. The men also gave blood so that researchers could test for hormones(荷尔蒙) linked to appetite and fatness. At the end of the week, the men, whose mean weight starting out was 105 kg, had lost on average about 1.5 kg. The men’s blood pressure also dropped, which the researchers attributed to weight lost. Exactly what caused the weight loss is uncertain. Loss of appetite is common at higher altitudes, and indeed the men ate significantly less than usual--about 700 calories fewer per day. Lippl also notes that because their consumption was being recorded, they may have been more self-conscious about what they ate. Regardless, eating less accounts for just 1 kg of the 1.5 kg lost, says Lippl. He thinks the increased metabolic(新陈代谢的) rate, which was measured, also contributed to weight loss but cannot separate the different effects with the given data. Appetite loss at high altitudes could certainly be key, notes Damian Bailey, a physiologist at the University of Glamorgan, UK, who recently lost 11 kg during a 3-month expedition to the Andes in Chile. Unfortunately, for the average person there’s no treatment that can resemble living at high altitude, says Lippl. The only alternative is a hypobaric chamber, which exposes subjects to low oxygen and isn’t practical as a therapy. He says, half-jokingly, "if fat people plan their holidays, they might not go to the sea, but maybe to the mountains.\ Why does Damian Bailey agree with the idea of appetite loss at high altitudes
Questions 23 to 25 are based on the conversation you have just heard. How did the woman learn to do most of the handy things in her hobbies
案例分析题Over the last two years, in the PC business Michael Dell has been beaten like a rented mule. His company continues to lose market (47) particularly in the U.S.Industry analysts would say that Dell has done a poor job of bringing out (48) and attractive products. Apple Mac sales keep rising. HP, Sony, and Lenovo have (49) new product lines which have had warm (50) .Dell’s core business is being hit by three things. The first is that the company was fairly late at (51) into retail outlets(零售店) overseas. It (52) on its direct sales model for too long. The second problem is that the recession has (53) Dell’s sales. Dell’s final problem is that it cannot find the right people to run the company. It (54) dumped most of the senior management that it hired just over a year ago. It takes time for new people to get up to speed.Word has gotten out that Dell plans to launch its own high-end smartphone. Dell does not do well what it is supposed to do well. It has become a second rate PC company. It proposes to partially offset that by entering a business which is controlled by Apple and RIM, the maker of the Blackberry. Because smartphone margins are high, Nokia, the world largest cellphone company, Samsung, and Sony Ericsson are also (55) into the market. The traffic jam is going to be (56) . So Dell can’t win in the handset business. What it ought to do is to try to improve its PC business. 54（）
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