单选题Which of the following is the least desirable to a journalist according to the author?

单选题According to studies cited by the National Eating Disorders Association, 42 percent of girls in first through third grade want to be thinner, 81 percent of 10-year-olds are afraid of being fat, and 51 percent of 9-and 10-year-old girls feel better about themselves if they are on a diet. In many ,ways, this fixation on weight at ever earlier ages comes at an inopportune time physiologically. At a recent Hadassah meeting at the Woodlands Community Temple in White Plains, Dr. Maxcie Schneider, the director of adolescent medicine at Greenwich Hospital, and Erica Leon, a registered dietitian, spoke about early adolescence as a time when a little bit of pudginess is necessary for proper growth, and youngsters wrestle constantly with their body image. "I can't tell you how many kids I've seen who've been on the Atkins diet, or on the South Beach diet," Ms. Leon said, adding that overweight children who try diets can be at risk of developing eating disorders. After the presentation, three mothers from Hartsdale who wanted to help their children avoid such issues spoke about how their young daughters are already beginning to become weight-conscious. Anorexia is a mental illness in which the victim eats barely enough to survive, because her distorted thinking makes her think she is fat. Bulimia, a mental illness in which someone binges on large amounts of food, then purges it through vomiting or the abuse of laxatives, is on the rise, and is surfacing in younger and younger patients, mostly girls, said Judy Scheel, the director of the Center for Eating Disorder Recovery in Mount Kisco. About 90 percent of victims of eating disorders are female, and often the male victims are on teams like wrestling and crew, where they must keep their weight low for competitive reasons. Dr. Scheel believes that where girls claim the eating disorder enables them to be thin, boys typically state their goal is to achieve or maintain a muscular but thin physique. The average onset for bulimia used to be 17, but to see teenagers age 14 and 15 with bulimia is common these days, Dr. Scheel said. Other people believe the disorders have genetic or chemical components, and many people with eating disorders respond well to anti-depressants, for example. "A certain amount of education is necessary to help young people avoid becoming obsessed with their body image. Teachers need to stay outside of talking about diets," Dr. Scheel said. "It's like a parent, always talking about their next diet. You have to help a child understand that if you cat healthily and exercise, your body is going to take care of itself." And in relatively homogenous populations, like in some Westchester schools, competition runs high. "So the young people don't really see how beautiful diversity is," she said, "and they tend to all be competing for kind of the same goals./

单选题{{B}}Directions:{{/B}} Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points) Health implies. more than physical fitness. It also implies mental and emotional wellbeing. An angry, frustrated, emotionally{{U}} (1) {{/U}}person in good physical condition is not{{U}} (2) {{/U}}healthy. Mental health, therefore, has much to do{{U}} (3) {{/U}}how a person copes with the world as it exists. Many of the factors that{{U}} (4) {{/U}}physical health also affect mental and emotional well-being. Having a good self-image means that people have positive{{U}} (5) {{/U}}pictures and good positive feelings about themselves, about what they are capable{{U}} (6) {{/U}}, and about the roles they play. People with good self-images like themselves, and they are{{U}} (7) {{/U}}like others. Having a good self- image is based{{U}} (8) {{/U}}a realistic{{U}} (9) {{/U}}of one's own worth and value and capabilities. Stress is an unavoidable, necessary, and potentially healthful{{U}} (10) {{/U}}of our society. People of all ages{{U}} (11) {{/U}}stress. Children begin to{{U}} (12) {{/U}}stress during prenatal development and during childbirth. Examples of stress-inducing{{U}} (13) {{/U}}in the life of a young person are death of a pet, pressure to{{U}} (14) {{/U}}academically, the divorce of parents, or joining a new youth group. The different ways in which individuals{{U}} (15) {{/U}}to stress may bring healthful or unhealthy results. One person experiencing a great deal of stress may function exceptionally well{{U}} (16) {{/U}}another may be unable to function at all. If stressful situations are continually encountered, the individual's physical, social, and mental health are eventually affected. Satisfying social relations are vital to{{U}} (17) {{/U}}mental and emotional health. It is believed that in order to{{U}} (18) {{/U}}, develop, and maintain effective and fulfilling social relationships people must{{U}} (19) {{/U}}the ability to know and trust each other, understand each other, influence, and help each other. They must also be capable of{{U}} (20) {{/U}}conflicts in a constructive way.

单选题By saying that "Angelos has Become a national cause celebre" (Line 1, Paragraph 8), the author implies that

单选题If you are a tourist interested in seeing a baseball game while in New York, you can find out which of its teams are in town simply by sending a message to AskForCents.com. In a few minutes, the answer comes back, apparently supplied by a machine, but actually composed by a human. Using humans to process information in a machine-like way is not new: it was pioneered by the Mechanical Turk, a famed 18th-century chess-playing machine that was operated by a hidden chessmaster. But while computers have since surpassed the human brain at chess, many tasks still baffle even the most powerful electronic brain. For instance, computers can find you a baseball schedule, but they cannot tell you directly if the Yankees are in town. Nor can they tell you whether sitting in the bleachers is a good idea on a first date. AskForCents can, because its answers come from people. "Whatever question you can come up with, there's a person that can provide the answer—you don't have the inflexibility of an algorithm-driven system," says Jesse Heitler, who developed AskForCents. Mr. Heitler was able to do this thanks to a new software tool developed by Amazon, the online retailer, that allows computing tasks to be farmed out to people over the internet. Aptly enough, Amazon's system is called Mechanical Turk. Amazon's Turk is part toolkit for software developers, and part online bazaar: anyone with intemet access can register as a Turk user and start performing the Human Intelligence Tasks (HITs) listed on the Turk website (mturk.com). Companies can become "requesters by setting up a separate account, tied to a bank account that will pay out fees, and then posting their HITs. Most HITs pay between one cent and $5. So far, people from more than 100 countries have performed HITs, though only those with American bank accounts can receive money for their work; others are paid in Amazon gift certificates. Mr. Heitler says he had previously tried to build a similar tool, but concluded that the in-frastucture would be difficult to operate profitably. Amazon already has an extensive software infrastructure designed for linking buyers with sellers, however, and the Turk simply extends that existing model. Last November Amazon unveiled a prototype of the system, which it calls "artificial artificial intelligence". The premise is that humans are vastly superior to computers at tasks such as pattern recognition, says Peter Cohen, director of the project at Amazon, so why not let software take advantage of human strengths? Mr. Cohen credits Amazon's boss, Jeff Bezos, with the concept for the Turk. Other people have had similar ideas. Eric Bonabeau of Icosystem, an American firm that builds software tools modeled on natural systems, has built what he calls the "Hunch Engine" to combine human intelligence with computer analysis. The French postal service, for example, has used it to help its workers choose the best delivery routes, and pharmaceutical researchers are using it to determine molecular structures by combining their gut instincts with known results stored in a database. And a firm called Seriosity hopes to tap the collective brainpower of the legions of obsessive players of multiplayer online games such as "World of War-craft ", by getting them to perform small real-world tasks (such as sorting photographs) while playing, and paying them in the game's own currency.

单选题According to the model, what normally signals the disappearance of an El Nifio?

单选题Business cards are usually used to______

单选题The human nervous system differs from that of animals in that

单选题What is the main topic of the article?

单选题{{B}}Text 4{{/B}} The World Health Organization says as many as 10 million persons worldwide may have the virus(病毒)that causes AIDS. Experts believe about 350 thousand persons have the disease. And one million more may get it in the next five years. In the United States, about 50000 persons have died with AIDS. The country's top medical official says more than 90 percent of all Americans who had the AIDS virus five years ago are dead. There is no cure for AIDS and no vaccine (疫苗) medicine to prevent it. However, researchers know much more about AIDS than they did just a few years ago. We now know that AIDS is caused by a virus. The virus invades healthy cells including white blood cells that are part of our defense system against disease. It takes control of the healthy cell's genetic(遗传的)material and forces the cell to make a copy of the virus. The cell then dies. And the viral particles move on to invade and kill more healthy cells. The AIDS virus is carried in a person's body fluids. The virus can be passed sexually or by sharing instruments used to take intravenous (静脉内的) drugs. It also can be passed in blood products or from a pregnant woman with AIDS to her developing baby. Many stories about the spread of AIDS are false. You cannot get AIDS by working or attending school with someone who has the disease. You cannot get it by touching, drinking glasses or other objects used by such persons. Experts say no one has gotten AIDS by living with, caring for or touching an AIDS patient. There are several warning signs of an AIDS infection. They include always feeling tired, unexplained weight loss and uncontrolled expulsion of body wastes(大小便失禁). Other warnings are the appearance of white areas on the mouth, dark red areas of skin that do not disappear and a higher than normal body temperature.

单选题Which of the following is TRUE according to par