单选题This exercise will be helpful for your health.A. profitableB. uselessC. beneficialD. awful

单选题When she was invited to dinner, she readily accepted.

单选题Which of the following items is NOT included in the data that the researchers collected?

单选题Skin Cancer Melanoma (黑素瘤), the deadliest kind of skin cancer is now the most cormnon cancer in (51) British women, the country's leading cancer organization said Wednesday. Skin cancer has (52) cervical (子宫颈的) cancer as the top cancer striking women in their 20s, according to the latest data from Cancer Research United Kingdom. The trend is particularly (53) since younger people are not generally those most susceptible (易患的) to melanoma. Rates of skin cancer are (54) highest in people over age 75. But experts worry that increasing numbers of younger people being diagnosed with skin cancer could be the (55) of a dangerous trend. Women in their 20s make (56) a small percentage of all patients diagnosed with melanoma in Britain, but nearly a third of all cases occur in people younger than 50. Based on current numbers Cancer Research UK predicts that melanoma will become the fourth (57) common cancer for men and women of all ages by 2024, and that cases will jump from about 9,0000 cases a year to more than 15,500. Cancer experts (58) the rising number of skin cancer cases largely to the surge in people using tanning salons. "Spending time on sun beds is just as (59) as staying out too long in the sun," said Caroline Cerny of Cancer Research UK. The organization is starting a SunSmart (60) to warn Britons of the dangers of being too bronzed. "The intensity of ultraviolet rays in some sun beds can be more than 10 (61) stronger than the midday sun," Cerny said. In the United States, several states require parental approval (62) minors can use tanning salons. Wisconsin bans people 16 and (63) from using tanning beds, and others ban children under 14. At least 29 states have regulations governing minors use of tanning salons. In the UK, Scottish politicians passed legislation banning these under 18 from using tanning beds, though it hasn't yet been implemented. There are no plans for (64) in the rest of the UK. The world Health Organization has previously recommended that tanning beds be regulated because of their potential to damage DNA in the skin. Experts said most deadly skin cancers could be (65) if people took the proper precautions when in the sun and avoided tanning beds.

单选题He is going to {{U}}compile{{/U}} the data requested by the tax collector. A. sprout B. evade C. redeem D. gather

单选题Cement was seldom used in building during the Middle Ages.

单选题Marsha confessed that she knew nothing of computer.

单选题Sometimes it is advisable to book hotels in advance .

单选题It is laid down in the regulations that all members must carry their membership cards at all times.

单选题America"s emphasis on the importance of education for everyone has spurred scientific research.

单选题Natural Food as Choice of Healthy Diet Increasingly, over the past ten years, people—especially young people—have become aware of the need to change their eating habits, because 1 of the food they eat, particularly processed foods, is not good for health. Consequently, there has been a 2 interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers widely used in farming today. Natural foods, for example, are vegetables, fruit and grain 3 have been grown in soil that is rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it 4 essential vitamins and minerals. This in itself is a natural process 5 with the use of chemicals and fertilizers, the main purpose of which is to increase the amount but not the 6 of foods grown in commercial farming areas. Natural foods also include animals which have been allowed to feed and move 7 in healthy pastures. Compare this with what happens in the mass production of poultry: there are battery farms, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better 8 rubbish. Chickens kept in this way are not only 9 as food; they also pro- duce eggs which lack important vitamins. There are other aspects of healthy eating which are now receiving increasing 10 from experts on diet. Take, for example, the question of sugar. This is actually a nonessential food! 11 a natural alternative, such as honey, can be used to sweeten food if this is necessary, we can in fact do 12 it. It is not that sugar is harmful in itself. But it does seem to be additive: the quantity we use has grown steadily over the last centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is to provide us with energy, in the 13 of calories. There are no vitamins in it, no minerals and no fiber. It is significant that nowadays fiber is considered to be an important part of a healthy diet. In white bread, for example, the fiber has been removed. But it is 14 in unrefined flour and of course in vegetables. It is interesting to note that in countries where the national diet 15 large quantities of unrefined flour and vegetables, certain diseases are comparatively rare. Hence the emphasis is placed on the eating of whole meal bread and more vegetables by modem experts on "healthy eating".

单选题{{B}}第二篇{{/B}} The genes that help determine a person's individual characteristics—from the color of his eyes to the score he makes on an IQ test—are located on chromosomes within the cells of his body. Half of a person's chromosomes come from his father, half from his mother. Many diseases are the result of a single defective gene on one of the chromosomes. Achondroplastic dwarfism, for example, is caused by a dominant gene and any child who inherits it will have the disease. A genetic counselor confronted by a parent with such a disease could warn that half of his children risk the disease. More often, genetic diseases are caused by recessive genes. The most common is cystic fibrosis, a disorder that affects at least one in every 1600 babies and causes their lungs and other body organs to become congested with mucus. Some diseases, such as the blood-clotting disorder, hemophilia, are sex-linked recessive defects carried on the female X chromosome. Many genetic defects, such as the hemophilia of European royalty, can be traced back through the family tree. And a genetic counselor can calculate probable risks for couples even before they have defective children. But faulty genes may also occur without warning by mutation in any generation. In recent years, researchers have detected a number of disorders caused by an extra chromosome, or lack of part of a chromosome. Mongolism, a form of retardation accompanied by short stature, a flattened nose and broad hands and feet, is caused by an extra chromosome. The parents of such a child have little increased risk of having another Mongoloid. There are blood, urine and other tests which show promise in detecting more than 100 genetic diseases, including cystic fibrosis, hemophilia and some forms of muscular dystrophy. Researchers are also detecting genetic defects even before a child is born. "Intrauterine detection," notes Dr. Henry L. Nadler of Northwestern University Medical School, "brings a new dimension to genetic counseling. The physician may now inform the parents that they will have either an affected or a normal child. "

单选题Stress and Heart Disease If you often feel angry and overwhelmed, like the stress in your life is spinning out of control, then you may be hurting your heart. If you don"t want to break your own heart, you need to learn to take charge of your life where you can—and recognize there are many things beyond your control. So says Dr. Robert S. Eliot, author of a new book titled From Stress to Strength: How to Lighten Your Load and Save Your Life. He"s a clinical professor of medicine at the University of Nebraska. Eliot says there are people in this world whom he calls "hot reactors". For these people, being tense may cause tremendous and rapid increases in their blood pressure. Eliot says researchers have found that stressed people have higher cholesterol levels, among other things. "We"ve done years of work in showing that excess alarm or stress chemicals can literally burst heart muscle fibers. When that happens it happens very quickly, within five minutes. It creates many short circuits, and that Causes crazy heart rhythms. The heart beats like a bag of worms instead of a pump. And when that happens, we can"t live." Eliot, 64, suffered a heart attack at age 44. He attributes some of the cause to stress. For years he was a "hot reactor". On the exterior, he was cool, calm and collected, but on the interior, stress was killing him. He"s now doing very well. The main predictors of destructive levels of stress are the FUD factors—fear, uncertainty and doubt—together with perceived lack of control, he says. For many people, the root of their stress is anger, and the trick is to find out where the anger is coming from. "Does the anger come from a feeling that everything must be perfect?" Eliot asks. One step to calming down is to recognize you have this tendency. Learn to be less hostile by changing some of your attitudes and negative thinking. Eliot recommends taking charge of your life. "If there is one word that should be substituted for stress, it"s control. Instead of the FUD factors, what you want is the NICE factors—new, interesting, challenging experiences." "You have to decide what parts of your life you can control," he says. "Stop where you are on your trail and say, "I"m going to get my compass out and find out what I need to do."" He suggests that people write down the six things in their lives that they feel are the most important things they"d like to achieve. Ben Franklin did it at age 32. "He wrote down things like being a better father, being a better husband, being financially independent, being stimulated intellectually and remaining even-tempered—he wasn"t good at that." From Eliot"s viewpoint, the other key to controlling stress is to realize that there are other troublesome parts of your life over which you can have little or no control—like the economyand politicians.

单选题Many doctors don't believe that music can treat diseases because________

单选题Bill Gates: Unleashing Your Creativity I"ve always been an optimist and I suppose that is rooted in my belief that the power of creativity and intelligence can make the world a better place. For as long as I can remember, I"ve loved learning new things and solving problems. So when I sat down at a computer for the first time in seventh grade, I was hooked. It was a clunky old teletype machine and it could barely do anything compared to the computers we have today. But it changed my life. When my friend Paul Allen and I started Microsoft 30 years ago, we had a vision of "a computer on every desk and in every home", which probably sounded a little too optimistic at a time when most computers were the size of refrigerators. But we believed that personal computers would change the world. And they have. And after 30 years, I"m still as inspired by computers as I was back in seventh grade. I believe that computers are the most incredible tool we can use to feed our curiosity and inventiveness to help us solve problems that even the smartest people couldn"t solve on their own. Computers have transformed how we learn, giving kids everywhere a window into all of the world"s knowledge. They"re helping us build communities around the things we care about and to stay close to the people who are important to us, no matter where they are. Like my friend Warren Buffett, I feel particularly lucky to do something every day that I love to do. He calls it "tap-dancing to work". My job at Microsoft is as challenging as ever, but what makes me "tap-dance to work" is when we show people something new, like a computer that can recognize your handwriting or your speech, or one that can store a lifetime"s worth of photos, and they say, "I didn"t know you could do that with a PC!" But for all the cool things that a person can do with a PC, there are lots of other ways we can put our creativity and intelligence to work to improve our world. There are still far too many people in the world whose most basic needs go unmet. Every year, for example, millions of people die from diseases that are easy to prevent or treat in the developed world. I believe that my own good fortune brings with it a responsibility to give back to the world. My wife, Melinda, and I have committed to improving health and education in a way that can help as many people as possible. As a father, I believe that the death of a child in Africa is no less poignant or tragic than the death of a child anywhere else, and that it doesn"t take much to make an immense difference in these children"s lives. I"m still very much an optimist, and I believe that progress on even the world"s toughest problems is possible—and it"s happening every day. We"re seeing new drugs for deadly diseases, new diagnostic tools, and new attention paid to the health problems in the developing world. I"m excited by the possibilities I see for medicine, for education and, of course, for technology. And I believe that through our natural inventiveness, creativity and willingness to solve tough problems, we"re going to make some amazing achievements in all these areas in my lifetime.

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. 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 U.S. 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 Refugel could be a major new U.S. 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Exercise Can Replace Insulin for Elderly Diabetics Most old people with so-called type Ⅱ diabetes could stop taking insulin if they would do brisk exercise for 30 minutes just three times a week, according to new medical research results reported in the Copenhagen newspaper Berlingske Tidende on Monday. Results from tests conducted on diabetics at the Copenhagen Central Hospital Rigshospitalet"s Center for Muscle Research showed that physical exercise can boost the body"s ability to utilise insulin by 30 percent, the newspaper reported. This is equal to the effect most elderly diabetics get from their insulin medication today, it said. Researchers had a group of non-diabetic men and a group of men with type Ⅱ, all more than 60 years of age, exercise on bicycles six times a week for three months. After the three months the doctors measured how much sugar the test subjects" muscles could utilise as a measure for how well their insulin worked. Associate Professor Dr. Flemming Dela of the Muscle Research Center said the tests demonstrated that the exercising diabetics had just as high insulin utilisation as the healthy non-exercising persons. "This means that the insulin works just as well for both groups. Physical exercise cannot cure people of diabetes, but it can eliminate almost all their symptoms. At the same time it can put off the point at which they have to begin taking insulin or perhaps completely avoid insulin treatment," Dela was quoted as saying. Insulin is a hormone produced by the pancreas, controlling sugar in the body and used against diabetes. Dela said that to achieve the desired effect diabetics need only exercise to the point where they begin to work up a sweat, but that the activity has to be maintained since it wears off after five days without sufficient exercise. Most diabetics realise that they have to watch their diet while remaining unaware of the importance of exercise, Dela added.

单选题He was criticized by the committee for failing to report the accident.A. disapprovedB. exhaustedC. excludedD. blamed

单选题As people continue to grow and age, our body systems continue to change. At a certain point in your life your body systems will begin to weaken. Your joints may become stiff. It may become more difficult for you to see and hear. The slow change of ageing causes our bodies to lose some of their ability to bounce back form disease and injury. In order to live longer, we have always tried to slow or stop this process that leads us toward the end of our lives. Many factors contribute to your health. A well-balanced diet plays an important role. The amount and type of exercise you get is another factor. Your living environment and the amount of stress you are under is yet another. But scientists studying senescence (衰老)want to know: Why do people grow old? They hope that by examining the ageing process on a cellular level medical science may be able to extend the length of life. There is nothing to be afraid of as old age approaches. Many consider the later portions of life to be the best time for living. Physical activity may lessen, but often you gain a broader understanding of yourself and the world. What we consider old age now may only be middle-aged some day soon. Who knows, with so many advances in medical science happening so quickly, life spans may one day be measured in centuries, rather than in years!

单选题Don"t irritate her. she"s on a short fuse today.