单选题—The sea is very rough today. —Yes， I"ve never seen _______ before.

单选题Whataretheytalkingabout?A.Breakfast.B.Lunch.C.Supper.

单选题This dictionary is for people who want to use modern English. It offers accurate and detailed information on the way modern English is used in all kinds of communication. It is a useful guide to writing and speaking English as well as an aid to reading and understanding. This dictionary looks rather like most others if you don"t look too closely. Actually it is quite new and different. The techniques used to compile it are new and use advanced computer technology. For the user, the kind of information is different, the quality of information is different, and the presentation of the information is different. For the first time, a dictionary has been compiled by the thorough examination of a representative group of English text, spoken and written, running to many millions of words. This means that in addition to all the tools of the conventional dictionary makers—wide reading and experience of English, other dictionaries and of course eyes and ears—this dictionary is based on hard, measurable evidence. No major uses are missed, and the number of times a use occurs has a strong influence on the way the entries are organized. Equally, the large group of texts, called the corpus, gives us reasonable grounds for omitting many uses and word-forms that do not occur in it. It is difficult for a conventional dictionary, in the absence of evidence, to decide what to leave out, and a lot of quite misleading information is thus preserved in the tradition of lexicography. This dictionary makes a break with such traditions. We have gone back to basics and collected many millions of words, and put them into a very large computer. The dictionary team has had daily access to about 20 million words, with many more in specialized stores. The words came from books, magazines, newspapers, pamphlets, leaflets, conversation, radio and television broadcasts. The sources are gratefully acknowledged on page xxii. The aim was to provide a fair representation of contemporary English. No set of texts, however large, can be fully relied on; all the time the information from the texts has been analysed and appraised by a team of lexicographers, whose professional knowledge has also been used wherever there is only a small amount of evidence of the usage of a word or phrase. The quality of information in this dictionary is different from others. With our textural evidence it is possible to be precise about the shape of phrases and the extent of their variation; the relative importance of different senses of a word; and the typical environment in which a word or phrase is used. Even when statements like this are already familiar, they are made with a different kind of authority in this book.

单选题The teenager is a uniquely human phenomenon. Adolescents are known to be moody, insecure, argumentative, restless, impulsive, impressionable, reckless and rebellious. Teenagers are also characterized by odd sleeping patterns, sudden burst of emotion, bullying, and snobbish behavior. So what could be the possible benefit of the teenage phase? Most other animals—apes and human ancestors included—skip that stage altogether, developing rapidly from infancy to full adulthood. Humans, in contrast, have a very puzzling four-year gap between sexual maturity and prime reproductive age. Anthropologists disagree on when the teenage phase first evolved. There are a variety of current explanations for the existence of teenagers. Some believe that we need longer for our large brains to develop. Other explanations suggest that a teenage phase allows kids to learn about complex social behavior and other difficult skills, or that it is even required to develop coordinated bipedal bodies adapted to travelling long distances. Scientists once thought that the brain"s internal structure was fixed at the end of childhood, and teenage behavior was blamed on raging hormones and a lack of experience. Then researchers discovered that the brain undergoes significant changes during adolescence. According to many recent studies, teen brains really are unique. Though many brain areas mature during childhood, others mature later—such as the frontal and parietal lobes (顶叶), responsible for planning and self-control. Other studies have shown that teens fail to see the consequences of their actions, and that sudden increases in nerve connectivity in teen brains may make it difficult for teenagers to read social situations and other people"s emotions. One study in 2004 showed that teens have less brain activity in areas responsible for motivation and risk assessment, perhaps explaining why they are more likely to take part in risky activities such as abusing drugs and alcohol, develop a hard-to-kick smoking habit or indulge in under-age sex. Teenage pregnancies and rising rates of sexually transmitted diseases among teens are big problems—especially because today"s teen generation is the biggest the world has seen. a 2003 UN report revealed that one in five people were between 10 and 19, a total of 1.2 billion people. But not everyone agrees on the best way to tackle the problem. Some believe that comprehensive sex education is the key, while others argue for abstinence (禁欲) only education courses.

单选题______ how to deal with the trouble of the computer, Martin had to ask his brother for help. A) Not know B) Not known C) Not to know D) Not knowing

单选题______today, be would get there by Friday.

单选题His ______ nature will aid him in attaining success in this difficult job.

单选题He ______ in Japan as he left by boat last month. A. ought to arrive B. ought to have arrived C. should arrive D. must arrive

单选题The torch was______by a famous athlete at the opening of the sport meeting. A. implement B. deceive C. exemplify D. ignited

单选题According to the passage, the decline of Shell

单选题Compared to the yearly price changes that actually occurred on foreign agricultural markets during the 1880’s American farmers would have most preferred yearly price changes that were

单选题Don"t tell me such things ______ you are not certain.

单选题Passage 1 Many of the most flexible examples of tool use in animals come from primates (the order that includes humans, apes, and monkeys). For example, many wild primates use objects to threaten outsiders. But there are many examples of tool use by other mammals, as well as by birds and other types of animals. Tools are used by many species in the capture or preparation of food. Chimpanzees use sticks and poles to bring out ants and termites from their hiding places. Among the most complex tool use observed in the wild is the use of stones by Ivory Coast chimpanzees to crack nuts open. They select a large flat stone as an anvil (a heavy block on which to place the nuts) and a smaller stone as a hammer. Stones suitable for use as anvils are not easy to find, and often a chimpanzee may carry a haul of nuts more than 40 meters to find a suitable anvil. The use of tools in chimpanzees is especially interesting because these animals sometimes modify tools to make them better suited for their intended purpose. To make a twig more effective for digging out termites, for example, a chimp may first strip it of its leaves. Surprisingly, there is also a species of bird that uses sticks to probe holes in the search for insects. One of the species of Galapagos finch, the woodpecker finch, picks up or breaks off a twig, cactus spine, or leaf stem. This primitive tool is then held in the beak and used to probe for insects in holes in trees that the bird cannot probe directly with its beak. Birds have been seen to carry twigs from tree to tree searching for prey. Tools may also be used for defense. Hermit crabs grab sea anemones with their claws and use them as weapons to repel their enemies. Studies have demonstrated that these crabs significantly improve their chances against predators such as octopus by means of this tactic. Also, many species of forest-dwelling primates defend themselves by throwing objects, including stones, at intruders.

单选题Early critics of Emily Dickinson's poetry mistook for simplemindedness the surface of artlessness that in fact she constructed with such ______. A. astonishment B. vexation C. allusion D. cunning

单选题The first writer who took the vernacular as a serious way of presenting reality after Mark Twain is______.

单选题In a society where all aspects of our lives are dictated by scientific advances in technology, science is the essence of our existence. Without the vast advances made by chemists, physicists, biologist, geologist, and other diligent scientists, our standards of living would decline, our flourishing, wealthy nation might come to an economic depression, and our people would suffer from disease that could not be cured. As a society we ignorantly take advantage of the amenities provided by science, yet our lives would be altered interminably without them. Health care, one of the aspects of our society that separates us from our archaic ancestors, is founded exclusively on scientific discoveries and advances. Without the vaccines created by doctors, disease such as polio, measles, hepatitis, and the flu would pose a threat to our citizens, for although some of these disease may not be deadly, their side effects can be a vast detriment to an individual affected with the disease. In addition, science has developed perhaps the most awe-inspiring, vital invention in the history of the world, the computer. Without the presence of this machine, our world could exist, but the conveniences brought into life by the computer are unparalleled. Despite the greatness of present-day innovators and scientists and their revelations, it is requisite to examine the amenities of science that our culture so blatantly disregards. For instance, the light bulb, electricity, the telephone, running water, and the automobile are present-day staples of our society; however, they were not present until scientists discovered them. Because of the contribution of scientist, our world is ever metamorphosing, and this metamorphosis economically and personally comprise our society, whether our society is cognizant of this or not.

单选题{{B}}Passage Six{{/B}} The last decade has seen a tremendous expansion of scientific knowledge in human genetics. Our understanding of human genes and of the genetic basis of disease has grown dramatically. Currently, more than 4, 000 diseases are known to be genetic and are passed on in families. Moreover, it is now known that alterations in our genes play a role in such common conditions as heart disease, diabetes, and many types of cancer. The identification of disease-related genes has led to an increase in the number of available genetic tests that detect disease or an individual's risk of disease. New tests are being developed to detect colon cancer, breast cancer, and other conditions. Scientists are concerned not only that gene tests offered are reliable, but also that patients and health care professionals understand the limitations of such testing. The disclosure of test results could inflict psychological harm to a patient if safe and effective interventions are not also available. Gene testing involves examining a person's DNA-taken from cells in a sample of blood or, occasionally, from other body fluids or tissues--for some anomaly that flags a disease or disorder. In addition to studying genes, genetic testing in a broader sense includes biochemical tests for the presence or absence of key proteins that signal aberrant genes. The most widespread type of genetic testing is newborn screening. Each year in the United States, four million newborn infants have blood samples tested for abnormal or missing gene products. Some tests look for abnormal arrangements of the chemical bases in the gene itself, while other tests detect inborn errors by verifying the absence of a protein that the cell needs to function normally. Carrier testing can be used to help couples to learn if they carry--and thus risk passing to their children. Genetic tests-biochemical and DNA-based--also are widely available for the prenatal diagnosis of conditions such as Down syndrome. Much of the current excitement in gene testing centers on predictive gene testing: tests that identify people who are at risk of getting a disease, before any symptoms appear. Tests are already available in research programs for some two dozen diseases, and as more disease genes are discovered, more gene tests can be expected. Tests for a few rare cancers are already in clinical use. Predictive gene tests for more common types of cancer are still primarily a research tool, difficult to execute and available only through research programs to small numbers of people who have a strong family history of disease. But the field of gene testing is evolving rapidly, with new genes being discovered almost daily and innovations in testing arriving almost as quickly.