单选题What can we learn about African

单选题Kagan maintains that an infant's reactions to its first stressful experiences are part of a natural process of development, not harbingers of childhood unhappiness or signs of adolescent anxiety.

单选题{{B}}Passage 4{{/B}} In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civilization from the faces of terror". The company's share price skyrocketed, as did the stocks of other face-recognition companies, and airports across the globe began installing the software and running trials. As the results start to come in, however, the gloss (光滑表面) is wearing off. No matter what you might have heard about face-recognition software, Big Brother it ain't. The concern was based largely on an independent assessment of face-recognition systems carried out in 2000 in the U. S. by the Department of Defense. These tests found that to catch 90 per cent of suspects at an airport, face-recognition software would have to raise a huge number of false alarms. One in three people would end up being dragged out of the line and that's assuming everyone looks straight at the camera and makes no effort to disguise himself. Results from the recent airport trials would seem to justify that concern. Most face-recognition systems use some kind of geometric technique to translate a picture of a face into a set of numbers that capture its characteristics. Once it has identified these boundaries, the software calculates their relative sizes and positions and converts this geometry into what Visionics calls a "faceprint". Feed the software a series of mug-shots (通缉犯), and it'll calculate their faceprints. Then it can monitor live CCTV images for the faces of known suspects. When it finds a match, it raises an alarm. Even if the system does manage to capture a face, the problems aren't over. The trouble is that a suspect's faceprint taken from live CCTV is unlikely to match the one in the database in every detail. To give themselves the best chance of picking up suspects, operators can set the software so that it doesn't have to make an exact match before it raises the alarm. But there's a price to pay: the more potential suspects you pick up, the more false alarms you get. You have to get the balance just right. Despite the disappointing tests, some people insist that face-recognition technology is good enough to put terrorists off. After all the claims and counter-claims, with no one able to discern (洞察) the truth, the industry may soon have to face up to reality.

单选题Some countries give rare animals to important foreign visitors as a ______ of friendship.

单选题A(Always) since the creation of celluloid, B(plastics) have been found C(to have) D(a multitude) of industrial and commercial uses.

单选题I feel very sad that the young man's energetic initiative ______ with nothing in the experiment, for he met a lot of interference from the powerful authority.

单选题Mercury is the nearest planet to the sun and its period of ______ is 88 days. A. movement B. evolution C. return D. revolution

单选题At this school we aim to______the minds of all the students by reading.

单选题It could not be Uruled out/U that, sooner or later, the country would break out of the treaty.

单选题It can be inferred that Richard II's reign was ______.

单选题If a product looks different or tastes different from normal, the patient should first contact the pharmacist, who has a professional duty to ______ only licensed medicines.

单选题Which of the following statements is true of Lake Elsinore?

单选题[此试题无题干]

单选题According to the passage altogether how much money is wasted every year on gift-giving?

单选题When Blanchard was, making Cornish game hen for dinner, Bongo Marie acted as if paco was ______.

单选题Visanto Melina, R.D., got the surprise of her career last year, when Seattle-based vegetarian nutritionist was asked to give a seminar on vegetarianism at a senior citizen center. "I thought there"d be four or five people." she says. Instead, the room was packed with seniors who had paid a $5 fee to hear her advice. And their interest in better health wasn"t only keen; it was informed. "They"ve obviously been paying attention to new research," she says. If Melina studied demographic trends for a living, she probably wouldn"t have been so surprised. Trend watchers have verified an intriguing new phenomenon. Older people are turning to a vegetarian diet in ever-increasing numbers. Not surprisingly, demographics are driving the drift. By the year 2005, people born between 1949 and 1963 the Baby Boom Generation, will make up 38 percent of the American population. Furthermore, statistics suggest this educated, health-conscious, rebellious and relatively affluent contingent fits the traditional vegetarian profile. Add to the fact that older people seek natural, pleasant ways to combat problems associated with aging—weight gain, higher cholesterol and blood pressure, increased cancer risk and impaired digestion—and you have real motivation to go meatless, says Suzanne Havala, R. D., author of the American Dietetic Association"s position paper on vegetarianism. Quantifying this new trend isn"t easy, but a 1994 study by Health Focus Inc., an independent research organization based in Des Moines, Iowa, found that shoppers over age 50 are cutting down on their consumption of red meat or eliminating it from their diets entirely. More compelling evidence for the senior surge toward vegetarianism comes from vegetarian groups nationwide, which report a swell in the ranks of older vegetarians. For example, one out of five members of the new Syracuse (N.Y.) Area Vegetarian Education Society is over 50; unusually high for a fledgling organization. And two-thirds of the 850-member Vegetarian Society of Honolulu are also members of the American Association of Retired Persons, society executives say. An informal poll of older people suggests better health is often the main incentive and objective for turning veg. Three years ago Nancy Roberts, a 53-year-old Magazine editor, found herself doing what many people do over the holidays: overindulging in rich treats. However, this time it made her in. "The crash felt like the flu," she says. By chance, Roberts was asked to edit some vegetarian recipes during that same period. She made a few at home, and her "flu" disappeared. More dramatically, Ruth Heidrich believes vegetarianism saved her life. The 61-year-old marathoner and triathlete was diagnosed with breast cancer 14 years ago, at age 47. When an initial biopsy indicated far more cancer than her doctors had thought, she was ready to take desperate measures. On the day of the diagnosis, she spotted a newspaper ad looking for volunteers to enroll in a study of breast cancer and diet, conducted by John McDougall, M. D., a leading advocate of the use of diet to fight disease. After meeting McDougall and reviewing what she says was an eight-inch thick file of statistics linking a high-fat diet with breast cancer, Heidrich converted from a traditional American diet to an extremely low-fat regimen with no animal products. "I didn"t even have skim milk on my cereal," she says. After a mastectomy and reconstructive surgery, she is cancer-free. She never had to undergo radiation treatment or chemotherapy and believes her strict vegetarian diet helped speed her recovery from surgery.

单选题In the passage, which of the following is NOT included in the advantage of a survey of public opinions?

单选题The newly developed science of artificial intelligence aims at programming the computer to think, reason and react______people do.