单选题He______his old car for a new one as soon as he had won the prize.(2003年上海交通大学考博试题)

单选题The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility of there being explanations alternative to the one proposed. A．account for B．rule out C．guard against D．do with

单选题Joe puts too much______on pills from the drugstore and does not listen to his doctor.

单选题If you take a(n)______course like her you can learn English in less than two years.

单选题The attack was meticulously planned and executed.A. negligently I3. slovenly C. fussily D. discreetly

单选题More than two parties in different locations can talk______via a conference call.

单选题In some African countries, the cost of treating an AIDS patient may______his or her entire annual income.(2013年3月中国科学院考博试题)

单选题The board of directors have already discussed the subject ______ in the previous meetings and they will handle it in all its aspects.

单选题The United States (has sent) several (spacecrafts) into orbits (around the earth) and has collected a lot of (information).

单选题Timmer is known as a touch manager who demands ______ results.

单选题The truly incompetent may never know the depths of their own incompetence, a pair of social psychologists said on Thursday．"We found again and again that people who perform poorly relative to their peers tended to think that they did rather well, "Justin KrugeL co-author of a study on the subject, said in a telephone interview． Kruger and co-author David Dunning found that when it came to a variety of skills-logical reasoning, grammar,even sense of humor--people who essentially were inept never realized it, while those who had some ability were self-critical． "It had little to do with innate modesty,"Kruger said．"but rather with a central paradox： Incompetents lack the basic skills to evaluate their performance realistically．Once they get those skills, they know where they stand, even if that is at the bottom．" "Americans and Western Europeans especially had an unrealistically sunny assessment of their own capabilities, "Dunning said by telephone in a separate interview,"while Japanese and Koreans tended to give a reasonable assessment of their performance．hi certain areas, such as athletic performance, which can be easily quantified, there is less self-delusion, the researchers said．But even in some cases in which the failure should seem obvious, the perpetrator is blithely unaware of the problem．" This was especially true in the areas of logical reasoning, where research subjects—students at Cornell University,where the two researchers were based—often rated themselves highly even when they flubbed all questions in a reasoning test． Later,when the students were instructed in logical reasoning, they scored better on a test but rate themselves lower,having learned what constituted competence in this area． Grammar was another area in which objective knowledge was helpful in determining competence, but the more subjective area of humor posed different challenges, the researchers said． Participants were asked to rate how funny certain jokes were, and compare their responses with what an expert panel of comedians thought．On average, participants overestimated their sense of humor by about 1 6 percentage points． This might be thought of as the"above-average effect", the notion that most Americans would rate themselves as above average, a statistical impossibility． The researchers also conducted pilot studies of doctors and gun enthusiasts．The doctors overestimated how well they had performed on a test of medical diagnoses and the gun fanciers thought they knew more than they actually did about gun safety． So who should be trusted：The person who admits incompetence or the one who shows confidence?Neither,according to Dunning． "You can't take them at their word．You've got to take a look at their performance，”Dunning added．

单选题City officials am considering building a path to give the public ______ to the site. A. recreation B. excess C. excursion D. access

单选题{{B}}Passage Three{{/B}} {{B}} Seniors and the City{{/B}} Tens of thousands of retirees are pulling up stakes in suburban areas and fashioning their own retirement communities in the heart of the bustling city. They are looking for what most older people want: a home with no stairs and low crime rates. And they are willing to exchange regular weekly golf time for rich cultural offerings, young neighbors and plenty of good restaurants. Spying and opportunity, major real-estate developers have broken ground on urban sites they intended to market to suburban retirees. These seniors are already changing the face of big cities. One developer, Fran McCarthy asks: "Who ever thought that suburban flight would be round trip?" The trickle of older folks returning to the city has grown into a steady stream. While some cities, especially those with few cultural offerings, have seen an exodus of seniors, urban planners say others have become retirees magnets. Between 1999 and 2000, the population of 64-to-75-year-olds in downtown Chicago rose 17 percent. Austin, New Orleans, and Los Angeles have seen double-dig-it increases as well. There may be hidden health benefits to city living. A study reveals that moving from suburbs to the city can ward off the byproduct of aging-social isolation. In the next six years, downtowns are expected to grow even grayer. For affluent retirees, city life is an increasingly popular option.

单选题The United States incurs world-wide condemnation because it______ the international law of non-interference in the internal affairs of other countries.

单选题Despite his disappointing record this year, I ______ feel he is the best man in our team. A. therefore B. otherwise C. moreover D. nonetheless

单选题Kunming is usually cool in the summer, but Shanghai ______.

单选题His past affection for Jane ______ any new relationship impossible for him. A. resented B. rendered C. repelled D. resorted

单选题While some office jobs would seem ______ to many people, there are quite a few jobs that are stimulating, exciting and satisfying.

单选题{{B}}Text 1{{/B}} A study by scientists in Finland has found that mobile phone radiation can cause changes in human cells that might affect the brain, the leader of the research team said. But Darius Leszczynski, who headed the 2-year study and will present findings next week at a conference in Quebec (魁北克), said more research was needed to determine the seriousness of the changes and their impact on the brain or the body. The study at Finland's Radiation and Nuclear Safety Authority found that exposure to radiation from mobile phones can cause increased activity in hundreds of proteins in human cells grown in a laboratory, he said. "We know that there is some biological response. We can detect it with our very sensitive approaches, but we do not know whether it can have any physiological effects on the human brain or human body," Leszczynski said. Nonetheless, the study, the initial findings of which were published last month in the scientific journal Differentiation, raises new questions about whether mobile phone radiation can weaken the brain's protective shield against harmful substances. The Study focused on changes in cells that line blood vessels and on whether such changes could weaken the functioning of the blood-brain barrier, which prevents potentially harmful substances from entering the brain from the bloodstream, Leszczynski said. The study found that a protein called hsp27 linked to the functioning of the blood-brain barrier showed increased activity due to irradiation and pointed to a possibility that such activity could make the shield more permeable(能透过的), he said. "Increased protein activity might cause cells to shrink—not the blood vessels but the cells themselves—and then tiny gaps could appear between those cells through which some molecules could pass," he said. Leszczynski declined to speculate on what kind of health risks that could pose, but said a French study indicated that headache, fatigue and sleep disorders could result. "These are not life-threatening problems but can cause a lot of discomfort," he said, adding that a Swedish group had also suggested a possible link with Alzheimer's disease. "Where the truth is, I do not know," he said. Leszczynski said that he, his wife and children use mobile phones', and he said that he did not think his study suggested any need for new restrictions on mobile phone use.