单选题{{B}}第二篇{{/B}} How to Stay Young If you want to stay young, sit down and have a good think. This is the research finding by a team of Japanese doctors, who say that most of our brains are not getting enough exercises, and as a result, we are ageing unnecessarily soon. Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of ageing could be slowed down. With a team of colleagues at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages and varying occupations. Computer technology enabled the researchers to obtain precise measurement of the volumes of the front and side sections of the brain, which are related to intellect and emotion, and determine the human character. (The rear section of the brain, which controls functions like eating and breathing, does not contract with age, and one can continue living without intellectual or emotional faculties. ) Contraction of front and side part-as cells die off-was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds. Matsuzawa concluded from his tests that there is a simple remedy to the contraction normally associated with age: using the head. The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Matsuzawa, are lawyers, followed by university professors and doctors. White collar workers doing routine work in government offices are, however, as likely to have shrinking brains as the farm worker, bus driver and shop assistant. Matsuzawa's findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain cells need. "The best way to maintain good blood circulation is using the brain," he says. "Think hard and engage in conversation. Don't rely on pocket calculators. "

单选题According to Einstein's theory, objects in the area of a black hole

单选题 What should be done if one wants to gain or lose weight? The process of gaining or losing weight can be explained by comparing your body to your car. Both run {{U}} {{U}} 1 {{/U}} {{/U}}fuel, food for your body and gasoline for your car. Both {{U}} {{U}} 2 {{/U}} {{/U}}that fuel, first into heat, then energy, some of {{U}} {{U}} 3 {{/U}} {{/U}}is used to do work, and some emitted as waste. And {{U}} {{U}} 4 {{/U}} {{/U}}your car uses more energy when the engine is racing than when it is idling, {{U}} {{U}} 5 {{/U}} {{/U}}does your body use more energy when you are working hard than {{U}} {{U}} 6 {{/U}} {{/U}}you are resting. For the purpose of this comparison, {{U}} {{U}} 7 {{/U}} {{/U}}, there is one significant difference between them. Your car cannot store fuel by turning it into {{U}} {{U}} 8 {{/U}} {{/U}}else; all gasoline not {{U}} {{U}} 9 {{/U}} {{/U}}remains as gasoline. But your body stores {{U}} {{U}} 10 {{/U}} {{/U}}energy as fat. When the gas tank is {{U}} {{U}} 11 {{/U}} {{/U}}empty, the car won't run; but your body can burn fat to provide more energy. Therefore, if you want to gain weight, you must do {{U}} {{U}} 12 {{/U}} {{/U}}of two things: eat more calories (units of heat, therefore energy), or use less through {{U}} {{U}} 13 {{/U}} {{/U}}. If you want to lose weight, you do the {{U}} {{U}} 14 {{/U}} {{/U}}, decrease your intake of calories or increase the amount of energy you spend. There is {{U}} {{U}} 15 {{/U}} {{/U}}way. Gaining or losing weight is always a relation between intake and output of potential energy.

单选题Thomas Fuller {{U}}was{{/U}} so {{U}}skilled at{{/U}} mathematics that he was known in the eighteenth century as the “Virginia Calculator.”

单选题Although costs are falling, wheel motors are generally more expensive than conventional drivetrains, and they don't handle as well as conventional cars. Wheel-motor vehicles may not catch on in a big way for a decade or so, but improvements in the technology and the push for efficiency could transform ring magnets into a new standard for powering cars. What is the reason that wheel motors will no| catch up with traditional cars soon?A. Wheel motors are more expensive and prices are still rising.B. Wheel motors are not as easy as traditional cars to use.C. The technology is not making improvement at present.D. The technology cannot save as much energy as expecte

单选题Apparently in interviews he refuses to talk about his private life.

单选题Capital punishment was {{U}}abolished{{/U}} some years ago in some states of the U. S.

单选题Hundreds of years ago cloves were used to remedy headaches.

单选题The writer cites Goethe to prove that one can change one's habits.

单选题Hundreds of buildings were wrecked by the earthquake. A. shaken B. fallen C. damaged D. trembled

单选题Native American artwork and artifacts have been {{U}}enthusiastically{{/U}} collected and studied abroad for a number of years.

单选题Mary looked pale and Uweary/U.

单选题An important part of the national government is the Foreign Service, a branch of the Department of State.A. a unityB. a divisionC. an embassyD. an invasion

单选题Thirst for Oil Worldwide every day, we devour the energy equivalent of about 200 million barrels of oil. Most of the energy on Earth comes from the Sun. In fact enough energy from the Sun hits the planet"s surface each minute to cover our needs for an entire year, we just need to find an efficient way to use it. So far the energy in oil has been cheaper and easier to get at. But as supplies dwindle, this will change, and we will need to cure our addiction to oil. Burning wood satisfied most energy needs until the steam-driven industrial revolution, when energy-dense coal became the fuel of choice. Coal is still used, mostly in power stations, to cover one quarter of our energy needs, but its use has been declining since we started pumping up oil. Coal is the least efficient, unhealthiest and most environmentally damaging fossil fuel, but could make a comeback, as supplies are still plentiful: its reserves are five times larger than oil"s. Today petroleum, a mineral oil obtained from below the surface of the Earth and used to produce petrol, diesel oil and various other chemical substances, provides around 40% of the world"s energy needs, mostly fuelling automobiles. The US consumes a quarter of all oil, and generates a similar proportion of greenhouse gas emissions. The majority of oil comes from the Middle East, which has half of known reserves. But other significant sources include Russia, North America, Norway, Venezuela and the North Sea. Alaska"s Arctic National Wildlife Refuge could be a major new US source, to reduce reliance on foreign imports. Most experts predict we will exhaust easily accessible reserves within 50 years, though opinions and estimates vary. We could fast reach an energy crisis in the next few decades, when demand exceeds supply. As conventional reserves become more difficult to access, others such as oil shales and tar sands may be used instead. Petrol could also be obtained from coal. Since we started using fossil fuels, we have released 400 billion tonnes of carbon, and burning the entire reserves could eventually raise world temperatures by 13℃. Among other horrors, this would result in the destruction of all rainforests and the melting of all Arctic ice.

单选题We become {{U}}susceptible{{/U}} to the moods and feelings, the behavior and treatment of our spouse,

单选题His new movie depicts an ambitious American.

单选题Of all the changes that have taken place in English-language newspapers during the past quarter-century, perhaps the most far-reaching has been the inexorable decline in the scope and seriousness of their arts coverage. It is difficult to the point of impossibility for the average reader under the age of forty to imagine a time when high-quality arts criticism could be found in most big-city newspapers. Yet a considerable number of the most significant collections of criticism published in the 20th century consisted in large part of newspaper reviews. To read such books today is to marvel at the fact that their learned contents were once deemed suitable for publication in general-circulation dailies. We are even farther removed from the unfocused newspaper reviews published in England between the turn of the 20th century and the eve of World War Ⅱ at a time when newsprint was dirt-cheap and stylish arts criticism was considered an ornament to the publications in which it appeared. In those far-off days, it was taken for granted that the critics of major papers would write in detail and at length about the events they covered. Theirs was a serious business, and even those reviewers who wore their learning lightly, like George Bernard Shaw and Ernest Newman, could be trusted to know what they were about. These men believed in journalism as a calling, and were proud to be published in the daily press. "So few authors have brains enough or literary gift enough to keep their own end up in journalism," Newman wrote, "that I am tempted to define "journalism" as "a term of contempt applied by writers who are not read to writers who are."" Unfortunately, these critics are virtually forgotten. Neville Cardus, who wrote for the Manchester Guardian from 1917 until shortly before his death in 1975, is now known solely as a writer of essays on the game of cricket. During his lifetime, though, he was also one of England"s foremost classical-music critics, a stylist so widely admired that his Autobiography (1947) became a best-seller. He was knighted in 1967, the first music critic to be so honored. Yet only one of his books is now in print, and his vast body of writings on music is unknown save to specialists. Is there any chance that Cardus"s criticism will enjoy a revival? The prospect seems remote. Journalistic tastes had changed long before his death, and postmodern readers have little use for the richly upholstered Vicwardian prose in which he specialized. Moreover, the amateur tradition in music criticism has been in headlong retreat.

单选题In the latter case the outcome can be serious indeed.

单选题Some industrialized countries are unwilling to spend money in reducing pollution.

单选题Enormous sums of money have been spent on space exploration. A. Much B. Large C. Small D. Fixed