单选题It's often hard to see your mistakes as you're making them. When it comes to living arrangements, a humdinger is being made in this country right now and few have noticed it yet. "Yikes!The kids are moving back in!" Thus goes the mantra of the baby boom generation, circa 2007. Analysts estimate that some 18 million adults between the ages of 20 and 34 live with their parents. That's roughly a third of that age group. But letting the kids move back in is not the societal error we're talking about. Instead, the big mistake is the loudly voiced chagrin of the boomers. Most mistakenly decry the notion of the boomerang generation. In order to fully appreciate the depth of the error being made here, we all need to step back a bit and look at the bigger picture. This epidemic of kids moving back home is first, not "unprecedented," and second, it's not a bad thing. The precedent for this trend can be found among the other 6.2 billion non-Americans on the planet, many of whom happily live with their adult children, often in three-generation households. Then there's the growing number of non-Anglo Americans, including many recent immigrants, who see no problem in having adult kids contribute to the household. Finally, the agrarian history of this country before World War II allowed kids to live and work around the farm weI1 into adulthood. Adult kids moving back home is merely the most noticeable symptom of a larger, fundamental transformation of American society. We are nationally beginning to recognize the costs of the independence the so-called greatest generation foisted on us. We can't blame them. They did have to grow up fast. Kids in their generation went off to World War II and grew up on the bloody beaches of distant lands. After the war, the survivors had factories to build and the wealth to buy their white-picket-fence dream out West. They designed a social and fiscal system that has served their retirement years very well. But their historically unique retirement system mistakenly celebrated independence and ignored the natural state of human beings--that is, interdependence. Moreover, their system breaks down with the onslaught of their kids' retirement. We can already see the pension systems, both private and public, beginning to disintegrate under the weight of the baby boomers. We are now just starting to understand the substantial fiscal and psychological costs of separating the generations into so-called single-family homes with the ideal of a mother, father and two kids. But times change and so do cultures. Regarding boomerang kids, most demographers focus on the immediate explanations for the changes, such as the growing immigrant population, housing shortages and high prices, and out-of-wedlock childbearing. Many psychologists have noted that baby-boomer parents enjoy closer relationships with their fewer children that allow extended cohabitation. A recent survey conducted for Del Webb (a division of Pulte Homes Inc.)reports that only about one-quarter of baby boomers are happier once the kids move out. However, all these explanations are simply symptoms of the larger, more fundamental reuniting of Americans into households that include extended families--adult, kids, grandparents, grandchildren and other relatives -- rather than just nuclear families. The rate at which our American culture is adapting will accelerate as baby boomers begin retiring in waves. Creative housing arrangements are necessitating and allowing three generations to live together again- under one roof or in close proximity. Now some 6 million American grandparents are living under one roof with their grandchildren. Whether grandparents live in accessory apartments on the property or houses next door, these flexible housing options provide privacy and companionship at the same time. Grandparents can interact with their grandchildren while the parents work, and all benefit from the new togetherness. These 21st century housing arrangements are a creative way to handle the financial needs of the generation that is retiring and, yes, the adult children who are coming home. Such multigenerational households don't make sense for everyone. Personality conflicts or family characteristics preclude such arrangements for some. Legal constraints such as building and zoning codes are formidable obstacles in most communities across the country. Often more room is mandated for parking your car than parking your grandmother. Home builders have been more interested in selling houses that satisfy immediate needs rather than anticipating the needs of the growing numbers of aging Americans. The culture itself frequently gets in the way, reinforcing the perception of a stigma attaching to lack of independence- the adult child who just won't move out (and grow up) or the aging grandparent who eschews "being a burden". Despite these problems, once you begin talking with your friends about three-generation households, you will begin hearing stories about how such obstacles are being overcome. You also will begin hearing stories about the wonderful benefits of thinking about housing and family arrangements in creative ways. And you'll hear stories about the fundamental satisfaction of living together again.

单选题Speaker A: Uh, I wonder if I could possibly use your phone.Speaker B: ______

单选题Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone or horn, metal knives and more recently, rubber and plastic and that was where we stuck, in surgical instrument terms, for many years. In the 1960s a new tool was developed, one which was, first of all, to be of great practical use to the armed forces and industry, but which was also, in time, to change greatly the art and science of surgery. The tool is the laser(激光)and it is being used by more and more surgeons all over the world. As we all know, light is hot, any source of light—from the sun itself down to a simple match burning—will give warmth. But light is usually spread out over a wide area. The light in a laser beam(激光束), however, is concentrated(密集). This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized(针尖大小的)beam. Experiments with these pinpoint beams showed researchers that different energy sources produce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to operate on the back of human eye without harming the front of the eye, simply by passing a laser beam right through the eye-ball. No knives, no stitches(缝针), no unwanted damage—a true surgical wonder. Operations which once made patients tired and in need of long period of recovery time now leave them feeling calm and comfortable. So much more difficult operations can now be tried. The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting. Perhaps some cancers will be treated with laser in a way that makes surgery not only safer but also more effective. Altogether, tomorrow may see more and more information coming to light on the diseases which can be treated medically.

单选题Standard English is the variety of English which is usually used in print and which is normally taught in schools and to non-native speakers learning the language. It is also the variety which is normally (1) by educated people and used in news broadcasts and other (2) situations. The difference between standard and nonstandard, it should be noted, has (3) in principle to do with differences between formal and colloquial (4) ; standard English has colloquial as well as formal variants. (5) , the standard variety of English is based on the London (6) of English that developed after the Norman Conquest resulted in the removal of the Court from Winchester to London. This dialect became the one (7) by the educated, and it was developed and promoted (8) a model, or norm, for wider and wider segments of society. It was also the (9) that was carried overseas, but not one unaffected by such export. Today, (10) English is arranged to the extent that tile grammar and vocabulary of English are (11) the same everywhere in the world where English is used; (12) among local standards is really quite minor, (13) the Singapore, South Africa, and Irish varieties are really very (14) different from one another so far as grammar and vocabulary are (15) .Indeed, Standard English is so powerful that it exerts a tremendous (16) on all local varieties, to the extent that many of long-established dialects of England have (17) much of their vigor and there is considerable pressure on them to be (18) . This latter situation is not unique (19) English: it is also true in other countries where processes of standardization are (20) .But it sometimes creates problems for speakers who try to strike some kind of compromise between local norms and national, even supranational ones.

单选题The opinion that "Errors show that the learner has not changed his mother tongue habits into desired habits of the new language" is very likely to be held by______.

单选题The majority of the observers at the conference, in contradiction to the delegates, were opposed to ratification.

单选题[此试题无题干]

单选题This passage is primarily concerned with discussing______.

单选题Many a young scientist ______ engaged in the research work. A. have B. has C. have been D. has been

单选题______she realized it was too late to go home.

单选题One of the most pressing challenges that the United States—and indeed, the world—will face in the next few decades is how to alleviate the growing stress that human activities are placing on the environment. The consequences are just too great to ignore. Wildlife habitats are being degraded or disappearing altogether as new developments take up more land. Plant and animal species are becoming extinct at a greater rate now than at any time in Earth's history. As many as 30 percent of the world's fish stocks are overexploited. And the list goes on. Yet, there is reason to have hope for the future. Advances in computing power and molecular biology are among the tremendous increases in scientific capability that are helping researchers gain a better understanding of these problems. Recent developments in science and technology could provide the basis for some major, and timely actions that would improve our understanding of how human activities affect the environment. One priority for research is improving hydrological forecasting. It has been estimated that the world's water use could triple in the next two decades. Already, widespread water shortages have occurred in parts of China, India, North Africa, and the Arabian Peninsula. The need for water also is taking its toll on freshwater ecosystems in the United States. Only 2 percent of the nation's streams are considered in good condition, and close to 40 percent of native fish species are rare to extinct. Using a variety of new remote sensing tools, scientists can learn more about how precipitation affects water levels, how surface water is generated and transported, and how changes in the landscape affect water supplies. To prevent outbreaks of infectious diseases in plants, animals, and humans, more study is needed on how pathogens, parasites, and disease-carrying species—as well as humans and other species they infect— are affected by changes in the environment. The overuse of antibiotics both in humans and in farm animals has contributed to the growth of antibiotic-resistant microorganisms. Researchers can take advantage of new technologies in genetics and computing to better monitor and predict the effects that environmental changes might have on disease outbreaks. Humans have made alterations to Earth's surface—such as tropical deforestation, reduction of surface and ground water, and massive development—so dramatic that they approach the levels of transformation that occurred during glacial periods. Such alterations cause changes in local and regional climate, and will determine the future of agriculture. Recent advances in data collection and analysis should be used to document and better understand the causes and consequences of changes in land cover and use.

单选题{{B}}Directions: For each blank in the following passage, there are four choices marked A,B,C and D. Choose the one that is most suitable and mark your answer by blackening the corresponding letter on the Answer Sheet.{{/B}} Dr. William C. Stokoe, Jr., was the chairman of the English Department at Gallaudet University. He saw the way deaf people communicated and was extremely{{U}} (21) {{/U}}. He was a hearing person, and signs of the deaf were totally new to him. Dr. Stokoe decided to propose a study of sign language. Many other teachers were not interested, and thought Dr. Stokoe was{{U}} (22) {{/U}}to think about studying sign language. Even deaf teachers were not very interested in the project. However, Dr. Stokoe did not give up.{{U}} (23) {{/U}}, he started the Linguistics Research Program in'1957. Stokoe and his two deaf assistants, worked{{U}} (24) {{/U}}this project during the summer and after school. The three{{U}} (25) {{/U}}made films of deaf people signing. The deaf people in the films did not understand{{U}} (26) {{/U}}the research was about and were just trying to be nice to Dr. Stokoe. Many people thought the whole project was silly, but{{U}} (27) {{/U}}agreed with Dr. Stokoe in order to please him. Stokoe and his{{U}} (28) {{/U}}studied the films of signing. They{{U}} (29) {{/U}}the films and tried to see patterns in the signs. The results of the research were{{U}} (30) {{/U}}: the signs used by all of the signers{{U}} (31) {{/U}}certain linguistic rules. Dr. Stokoe was the first linguist to test American Sign Language{{U}} (32) {{/U}}a real language. He published the{{U}} (33) {{/U}}in 1960,but not many people paid attention to the study. Dr. Stokoe was still{{U}} (34) {{/U}}—he was the only linguist who{{U}} (35) {{/U}}that sign language was more than gestures. He knew it was a language of its own and not just another form of English.

单选题______ everything into consideration ,they ought to be given another chance.A. TakenB. TakingC. To takeD. Having taken

单选题Mrs. Green received an ______ letter threatening to expose her private life if she refused to pay $10,000.(2010年北京航空航天大学考博试题)

单选题Passage 4 Plant adaptation can be remarkably complex. Certain species of orchids, for instance, imitate female bees, other plants look and smell like animals, and still others have the appearance of stone. These strange adaptations to life represent just a few of the sophisticated means by which plants enhance their chances of survival. Mimicry in plants or animals is a three-part system. There is a model; the animal, plant, or substrate being imitated. There is a mimic; the organism that imitates the model. And there is a signal receiver or dupe; the animal that cannot effectively distinguish between the model and the mimic. Mimetic traits may include morphological structures, color patterns, behaviors, or other attributes of the mimic that promote its resemblance to a model. That model may be either an unrelated species or an inanimate objects such as the background against which an organism spends most of its time. Mimicry is not an active strategy on the part of an individual plant; flowers do no deliberately trick or deceive animals into visiting them. Mimicry arises as the result of evolution through natural selection and the occurrence of random generic mutations that lead over many generations to the appearance of favorable characteristics. If such traits help to camouflage a plant, for example, the plant is likely to have survival advantage over other plants that are less well camouflaged. The plant will leave more descendants, thereby passing the advantage to the next generation. For natural selection to favor the evolution of mimicry, the mimic must derive a reproductive advantage from modeling itself after another organism or object; its fitness, measured as the number of offspring produced that survive into the next generation must be increased as the result of deception.

单选题Will you please lend me the novel when you ______ ?

单选题Starting with the Upremise/U that there is life on the planet Mars, the scientist went on to develop his argument.