单选题The vaccine may be useful for treating other cancers.

单选题Cosmetic Surgery Surgery that can improve the way a person looks is becoming more and more popular in the United States. This kind of surgery is called cosmetic surgery, and both men and women are turning to this treatment as a way of keeping their appearance young as well as keeping competitive (有竞争力的 ) in their jobs. Men especially are beginning to turn to face-lifts (面部拉皮手术), liposuction (taking fat out of the body), and implants (putting artificial parts into their bodies ) to help them look younger. As companies downsize (缩编) and move younger employees into higher positions, older employees in their late forties and early fifties feel the need to look and act younger in order to stay competitive. These operations are not without dangers, however. One young woman had an eye operation to get rid of the bags under her eyes. She described her experience as terrible. She said, "When he started cutting, I was fully awake. Even though he"d given me an injection near my eyes, I saw everything. " She went on to explain, "I knew I had to keep still because of what he was doing. He was scraping (刮) away fat underneath my eyes. It took about ten minutes. After he finished, I felt I couldn"t walk. I was so faint." Her troubles did not end after the operation for two weeks. Her eyes were swollen (肿胀的) and almost completely closed, and even dark glasses could not hide the side effects of the operation. Liposuction, taking fat out of the body, is probably the most popular cosmetic operation in the United States. It seems simple enough. First, a small cut is made over the place where the patient wants the fat removed. Next, a small pipe is put into the cut. A machine like a vacuum cleaner is then used to suck the fat out of the body. However, as one doctor explained, some problems can happen after the operation. He warned, "Irregular lumps and loose skin can reset from this operation. If it is not evenly done, liposuction can produce a very lumpy result." Patients often must have more liposuction to correct the problem.

单选题A ballet is theatrical entertainment that combines the arts of dancing, stage design, and music.

单选题The use of chemical may present a certain hazard to the laboratory workers.

单选题Please ensure that your seatbelts are fastened while driving.A. make outB. make forC. make upD. make sure

单选题Cement was seldom used in buildings of the Middle Ages.

单选题Medical bills in the United States have risen violently since 1960's and steps need to be taken to reverse this trend or the average American will not be able to afford medical care. The major factor in increasing the cost of medical care has been the dramatic increase in the cost of hospital services. The rise in the cost of hospitalization can be only partly blamed on inflation (通货膨胀)since hospital bills in the last two decades have risen at a considerably higher rate than inflation. Another factor cited by doctors as a major cause for the increase in the cost of medical care is malpractice(治疗错误). Increasingly large awards for malpractice have caused doctors to increase their rates to cover the higher malpractice insurance. Because of the large malpractice awards, doctors are also prescribing more conservative and more extensive and therefore more costly treatment for patients as a defense against malpractice claims. Whatever the causes of the wild increases in the cost of medical care are, the government needs to take strong action before it is too late for Americans.

单选题The reason why he adapted to the new situations quickly is that he has a flexible attitude.

单选题In judging our work you should take into Uconsideration/U the fact that we have been very busy recently.

单选题We explored the possibility of expansion at the conference.

单选题The girl is gazing at herself in the mirror.

单选题Fahrenheit and Celsius Daniel Gabriel Fahrenheit and Anders Celsius both began work on their respective temperature scales in the 18 th century. A Dutch instrument maker, Fahrenheit (1688—1736) built on the work of Danish astronomer Ole Romer, who spent considerable time making meteorological observations and experimenting with thermometers. During the late 1600s and early 1700s, Isaac Newton led the fields in experimenting with thermometry. According to Newton, 12 degrees should separate the temperature of a water, ice, and salt solution from the temperature of the human body. Fahrenheit believed that the thermometer he invented in 1714 had eight times the accuracy of Newton"s thermometer, and therefore 96 degrees should separate these benchmarks (eight times Newton"s range). Using this new scale, a combination of water, ice and salt solution stayed at 0°, and body temperature registered as 96°. With these marks intact, a combination of water and ice (the freezing point)equated 32°. Scientists later found that water boiled at 212° according to the Fahrenheit scale. After more accurate testing 95.6° became the corrected body temperature that we know today. Celsius (1701—1744), a Swedish astronomer, developed the centigrade scale a bit later in 1742. He assigned 100° to the freezing point and 0° to the boiling point. This scale appeared in Sweden and France, but with the numbers reversed. The Celsius system received broad recognition for his work in 1948 when his name became the official title of this temperature scale. Opinion is still divided as to why one scale found favour in some parts of the world while the other was widely accepted elsewhere. Daniel Kelves, a historian, offers this theory: "Part of the reason, "he says, "is that the Fahrenheit system was developed first, and by a Dutchman; Holland and England enjoyed friendly relations at the time. The system later travelled to the American colonies. After the invention of the Celsius system, the French under Napoleon were at loggerheads with England, probably enforcing the division as well, "he says. To convert degrees Fahrenheit to degrees Celsius, subtract 32, then multiply the result by five-ninths. To convert from Celsius to Fahrenheit, multiply by nine-fifths, then add 32.

单选题Launched in the autumn of 1976 in London, and now published ten times a year.A. EndedB. FollowedC. IncludedD. Started

单选题下面有3篇短文后有5道题。请根据短文内容，为每题定为1个最佳选项。{{B}}第一篇{{/B}} Dreams Studies show that in dreams things are seen and heard rather that thought. In terms of the senses, visual experience is present in almost all dreams; auditory experience in 40 to 50 percent; and touch, taste, smell, and pain in a relatively small percentage. A considerable amount of emotion is commonly present, usually a pure and single emotion such as fear, anger, or joy. The clearly distinguishable states of sheep exist. The first state, called NREM-sheep (non-rap-id-eye movement sleep), occupies most of the sleep period and is associated with a relatively low pulse and blood pressure, and few or no reports of dreaming. The second type of sheep, known as REM-sleep (rapid-eye-movement sleep) occurs cyclically during the sleep period with rapid eye movements and frequent dream reports. Typically, a person has four or five periods of REM-sleep during the night, whether the dreams are remembered often, rarely, or not at all; they occur at intervals of about 90 minutes and altogether make up about 25 percent of the night's sleep (as much as 50 percent in a newborn child). Evidence indicates that a dream period usually lasts from 5 to 20 minutes. Sounds and touches working on a dreamer can go into a dream if they occur during a Remperiod. Although mental activity may be reported during NREM-sleep, these are usually short pieces of thought like experiences. Modern dream research has focused on two general interpretations of dream content. In one view, dreams have no meaning of their own but are simply a process by which the brain integrates new information into memories. In the other view, dreams contain real meaning symbolized in a picture language distinct from conscious logical thought. If dreams express important wishes, fears, concerns, and worries of the dreamer, the study and analysis of dreams can help reveal previously unknown aspects of a person's mental functioning.

单选题The leaves of the eucalyptus tree can be used to make a potent antiseptic that kills harmful bacteria in cuts and scrapes.

单选题Only three strategies are available for controlling cancer, prevention, screening and treatment. Lung cancer causes more deaths than any other type of cancer. A major cause of the disease is (51) known; there is no good evidence that screening is of much help; and treatment fails in about 90 per cent of all cases. At present, therefore, the main strategy must be (52) . This may not always be true, of course, as for some other types Of cancer, research (53) the past few decades has produced (or suggested) some important progress in prevention, screening or treatment. (54) , however, we consider not what research may one day offer but what today's knowledge could already deliver that is not being delivered, then the most practicable and cost-effective opportunities for avoiding premature death from cancer, especially lung cancer, probably involve neither screening nor improved (55) , but prevention. This conclusion does not depend on the unrealistic assumption that we can (56) tobacco. It merely assumes that we can reduce cigarette sales appreciably by raising prices or by (57) the type of education that already appears to have had a (58) effect on cigarette consumption by white-collar workers, and that we can substantially reduce the amount of tar delivered per cigarette. The practicability of preventing cancer by such measures applies not only in those countries, (59) the US, where, because cigarette smoking has been common for decades, 25～30 per cent of all cancer deaths now involve lung cancer, but also in those where it has become (60) only recently. In China, for example, lung cancer (61) accounts for only about 510 per cent of all cancer deaths. This is because it may take as much as half a century (62) the rise in smoking to increase the incidence of lung cancer. Countries where cigarette smoking is only now becoming widespread can expect enormous increases in lung cancer during the 1990s or early in the next century, (63) prompt effective action is taken against the habit--indeed., such increases are already plainly evident in parts of (64) . There are four reasons why the prevention of lung cancer is of such overwhelming importance: first, the disease is extremely common, causing more deaths than any other type of cancer now does; secondly, it is generally incurable; thirdly, effective, practicable measures to reduce its incidence are already reliably known; and, finally, (65) tobacco consumption will also have a substantial impact on many other diseases.

单选题It seems highly unlikely that she will pass the exam.

单选题Customers often defer payment for as long as possible. A. make C. postpone B. demand　D. obtain

单选题What are my chances of promotion if I stay here?

单选题can you follow the plot?