单选题Thomas Leech______a very successful career as a photographer.

单选题Small, pink and very ugly. Hardly the qualities of a star, but they describe the deformed mouse that was the media darling at a recent science exhibition in Beijing. With a complex tissue structure in the shape of a human ear grafted on to its back, the rosy rodent was a stunning symbol of the serious strides China is making in the field of biotechnology. China is fast applying the latest life-science techniques learned from the West m aggressively pursue genome research. It's establishing its own centers of technical excellence to build a scientific base to compete directly with the United States and Europe. With a plentiful supply of smart young scientists at home and lots of interest abroad biotechnology is on the brink of a boom in China and in the view of foreign scientists, Beijing is playing a clever hand, maximizing the opportunities open to them. For the moment, the cooperation exists mostly with Europe and the U. S. But Asia's other biotech leaders, Japan, Singapore and Korea, also are recognizing China's potential as an attractive low-cost base to conduct research. These partnerships--and China's advancement in the field of biotechnology--could help benefit the rest of Asia: China's rapid progress in improving crop yields will address food-security concerns in the region. In addition, China is more likely to focus on developing cheap technology that its predominantly poor population--and those of other Asian countries--can afford. There remain, however, serious barriers to the development of a strong biotech industry. Among them are a poor domestic legal framework, weak enforcement of intellectual-property rights and loose adherence to international standards. China is a signatory of the International Bio Safety Protocol, which should mean adherence to global standards governing the conduct of field trims. But some observers are skeptical. "The regulations look good, but I haven't met one scientist who believes they are being fully adhered to," says a European science analyst. If shortcuts are taken, then some of the recent scientific achievements trumpeted in the official press may never make it to market. But no matter how strict lab tests are, other problems lie in wait. For example, there is a number of tasks it would take years to fulfill in the patents office, says one lawyer, leaving innovators with little protection if they take a product to market in China.

单选题The combination of lenses in a compound microscope makes possible greater amplification than can be achieved with a single lens. A. management B. magnificence C. magnetism D. magnification

单选题Previous studies provoked ______ because they used patients whose diagnosis was questionable.

单选题He said it would not be all that difficult to reach a peaceful conclusion to the ______.(2010年四川大学考博试题)

单选题The scientists at the University of Bern in Switzerland have used a weakened virus that is not infectious and has proved safe and effective.

单选题In recent years, there has been a steady assault on salt from the doctors: Salt is bad for you — regardless of your health. Politicians also got on board. " There is a direct relationship" , US Conqressman Neal Smith noted, "between the amount of sodium a person consumes and heart disease, circulatory disorders, stroke and even early death". Frightening, if true! But many doctors and medical researchers are now beginning to feel the salt scare has gone too far. " All this hue and cry about eating salt is unnecessary," Dr. Dustan insists. "For most of us it probably doesn't make much difference how much salt we eat. " Dustan's most recent short-term study of 150 people showed that those with normal blood pressure underwent no change at all when placed on an extremely low-salt diet, or later when salt was reintroduced. Of the hypertensive subjects, however, half of those on the low-salt diet did experience a drop in blood pressure, which returned to its previous level when salt was reintroduced. "An adequate to somewhat excessive salt intake has probably saved many more lives than it has cost in the general population", notes Dr. John H. Laragh. "So a recommendation that the whole population should avoid salt makes no sense. " Medical experts agree that everyone should practice reasonable "moderation" in salt consumption. For an average person, a moderate amount might run from four to ten grams a day, or roughly 1/2 to 1/ 3 of a teaspoon. The equivalent of one to two grawrs of this salt allowance would come from the natural sodium in food. The rest would be added in processing, preparation or at the table. Those with kidney, liver or heart problems may have to limit dietary salt, if their doctor advises. But even the very vocal " low salt " exponent, Dr. Arthur Hull Hayes, Jr. admits that " we do not know whether increased sodium consumption causes hypertension". In fact, there is increasing scientific evidence that other factors may be involved: deficiencies in calcium, potassium, perhaps magnesium; obesity(much more dangerous than sodium); generic predisposition; stress. "It is not your enemy," says Dr. Laragh, "Salt is the No. 1 natural component of all human tissue, and the idea that you don't need it is wrong. Unless your doctor has proven that you have a salt-related health problem, there is no reason to give it up. "

单选题Governments that want their people to prosper in the burgeoning world economy should guarantee two basic rights: the right to private property and the right to enforceable contracts, says Mancur Olson in his book Power and Prosperity. Olson was an economics professor at the University of Maryland until his death in 1998. Some have argued that such rights are merely luxuries that wealthy societies bestow, but Olson turns that argument around and asserts that such rights are essential to creating wealth. "Incomes are low in most of the countries of the world, in short, because the people in those countries do not have secure individual rights," he says. Certain simple economic activities, such as food gathering and making handicrafts, rely mostly on individual labor; property is not necessary. But more advanced activities, such as the mass production of goods, require machines and factories and offices. This production is often called capital-intensive, but it is really property-intensive, Olson observes. "No one would normally engage in capital-intensive production if he or she did not have rights that kept the valuable capital from being taken by bandits, whether roving or stationary," he argues. "There is no private property without government--individuals may have possessions, the way a dog possesses a bone, but there is private property only if the society protects and defends a private right to that possession against other private parties and against the government as well." Would-be entrepreneurs, no matter how small, also need a government and court system that will make sure people honor their contracts. In fact, the banking systems relied on by developed nations are based on just such an enforceable contract system. "We would not deposit our money in banks ... if we could not rely on the bank having to honor its contract with us, and the bank would not be able to make the profits it needs to stay in business if it could not enforce its loan contracts with borrowers," Olson writes. Other economists have argued that the poor economies of Third World and communist countries are the result of governments setting both prices find the quantities of goods produced rather than letting a free market determine them. Olson agrees that there is some merit to this point of view, but he argues that government intervention is not enough to explain the poverty of these countries. Rather, the real problem is lack of individual rights that give people incentive to generate wealth. "If a society has clear and secure individual rights, there are strong incentives (刺激，动力) to produce, invest, and engage in mutually advantageous trade., and therefore at least some economic advance," Olson concludes.

单选题Contradictory to popular belief, recent surveys show that besides housewives, many college students are also ______ to soap operas.

单选题In the Chinese household, grandparents and other relatives play______roles in raising children.(2015年北京航空航天大学考博试题)

单选题A century ago the physician's word was______: to doubt it was considered almost sacrilegious.

单选题Water has become "cool" in the Minneapolis school district partly because ______.

单选题According to the article, in which area was it more energy-efficient?

单选题Among the many subjects in school, mathematics is probably the most ______ , depending least on a student's back ground and culture.

单选题 The mental health movement in the United States began with a period of considerable enlightenment. Dorothea Dix was shocked to find the mentally ill in jails and almshouses and crusaded for the establishment of asylums in which people could receive humane care in hospital-like environments and treatment, which might help restore them to sanity. By the mid-1800s, 20 states had established asylums, but during the late 1800sand early 1900s, in the face of economic depression, legislatures were unable to appropriate sufficient funds for decent care. Asylums became overcrowded and prison-like. Additionally, patients were more resistant to treatment than the pioneers in the mental health field had anticipated, and security and restraint were needed to protect patients and others. Mental institutions became frightening and depressing places in which the rights of patients were all but forgotten. These conditions continued until after Word War Ⅱ. At that time, new treatments were discovered for some major mental illnesses therefore considered untreatable (penicillin for syphilis of the brain and insulin treatment for schizophrenia and depressions), and a succession of books, motion pictures, and newspaper called attention to the plight of the mental illness. Improvements were made, and Dr. David Vail's Humane Practices program is a beacon for today. But changes were slow in coming until the early 1960s.At that time, the Civil Rights Movement led lawyers to investigate America's prisons, which were disproportionately populated by blacks, and they in turn followed prisoners into the only institutions that were worse than the prisons—the hospitals for the criminally insane. The prisons were filled with angry young men who, encouraged by legal support, were quick to demand their rights. The hospitals for the criminally insane, by contrast, were populated with people who were considered "crazy" and who were often kept obediently in their place through the use of severe bodily restraints and large doses of major tranquilizers. The young cadre of public interest lawyers liked their role in the mental hospitals. The lawyers found a population that was both passive and easy to champion. These were, after all, people who, unlike criminals, had done nothing wrong. And in many states they were being kept in horrendous institutions, an injustice which, once exposed was bound to shock the public and, particularly, the judicial conscience. Judicial interventions have had some definite positive effects, but there is growing awareness that courts cannot provide the standards and the review mechanisms that assure good patient care. The details of providing day-to-day care simple cannot be mandated by a court so it is time to take from the courts the responsibility for delivery of mental health care and assurance of patient fights and return it to the state mental health administrators to whom the mandate was originally given. Though it is a difficult task, administrators must undertake to write rules and standards and to provide the training and surveillance to assure that treatment is given and patients' rights are respected.

单选题"May I use your dictionary for a while?" "_____. You are welcome to use anything of mine."

单选题We have at present not any ______ of the furniture as you required.