填空题2. Birds vs. Environmentalists? In Wyoming. it' s the sage grouse (松鸡). In Colorado, it' s the lesser prairie chicken. In the Northwest, it' s the Washington ground squirrel. Across the country, a growing number of species are finding themselves at the center of a new battle being waged by environmentalists and developers. The issue- species being threatened by encroaching (侵占) human development -is nothing new, of course. (46) Wind energy has been touted as cost, effective to produce clean energy as well as jobs. (47) But not every environmentalist is happy about that development. Critics charge that wind energy development can cause habitat fragmentation - a displacement of a species that can eventually reduce its numbers - as well as the deaths of birds and bats that collide with the wind turbines' (涡轮) massive rotor blades (动叶片). (48) That's a low estimate, says Michael Fry of the American Bird Conservancy (美国鸟类保护协会). According to his group, turbines kill three to 11 birds per megawatt (兆瓦特) of wind energy they produce. Right now, there are about 20,000 megawatts produced in the United States, which can mean - at worst - up to 220,000 bird fatalities a year. (49) Whatever the number, the wind industry is hoping to avoid damaging its green reputation and is struggling with finding the right solution. Portiand has been experimenting with curtailment at its 34.5 -megawatt Casselman, Pa. , wind farm with some success, reducing bat mortality by 70 percent in a 2008 study. The company, which created the industry' s first Avian and Bat Protection Plan in 2008, has also pioneered a radar technology that detects approaching migratory birds and shuts down the turbines accordingly. (50) "The best option is to avoid putting it in those locations in the first place," says Doug Inkley, a senior scientist at the National Wildlife Federation. Members of the wind industry think that the issue may be, well, overblown. It' s not wind energy versus nothing; it' s wind energy versus some other form of energy which will also invariably have an impact - potentially more of an impact than a wind project.A. Now, the natural habitat that nurtured wildlife, 300 species of birds, thousands of species of fish, flora, and other ecological systems is rapidly disappearing.B. What is new? The encroachers aren't the usual suspects but the environmentally friendly wind - energy industry.C. But environmentalists argue that these measures aren' t enough, especially in areas like the Texas coast.D. That promise, along with new government subsidies, has helped wind turbines pop up on hills and fields throughout America.E. A 2007 study by the National Academy of Sciences puts the number of birds killed each year at about 20,000 to 30,000.F. With wind energy expected to produce 20 percent of this country' s energy by 2030, output would grow tenfold and, environmentalists worry, deaths could increase at a similar rat

填空题Reinventing the Table An earth scientist has rejigged the periodic table to make chemistry simpler to teach to students. (1) But Bruce Railsback from the University of Georgia says he is the first to create a table that breaks with tradition and shows the ions of each element rather than just the elements themselves. "I got tired of breaking my arms trying to explain the periodic table to earth students, " he says, criss-crossing his hands in the air and pointing to different bits of a traditional table. (2) But he has added contour lines to charge density, helping to explain which ions react with which. "Geochemists just want an intuitive sense of what's going on with the elements, " says Albert Galy from the University of Cambridge, (3) (4) He explains that sulphur, for example, shows up in three different spots — one for sulphide, which is found in minerals, one for sulphite, and one for sulphate, which is found in sea salt, for instance. He has also included symbols to show which ions are nutrients, and which are common in soil or water. (5) A. There have been many attempts to redesign the periodic table since Dmitri Mendeleev drew it up in I871. B. Railsback has still ordered the elements according to the number of protons they have. C. "I imagine this would be good for undergraduates. " D. Railsback has listed some elements more than once. E. And the size of element's symbol reflects how much of it is found in the Earth's crust. F. The traditional periodic table was well drawn.

填空题What Makes Me the Weight I Am? There"s no easy answer to this question. Your genetic makeup, the physical traits that get passed down to you from your parents, plays a big part in determining your size and weight. 1 But if your parents are smaller than average, you may want to rethink that professional basketball career! The same goes for your body type. Have you ever heard someone say a person is "big boned"? It"s a way of saying the person has a large frame, or skeleton. Big bones usually weigh more than small bones. 2 Like your height or body type, your genes have a lot to say about what your weight will be. But that"s only part of the story. Being overweight can run in someone"s family, but it may not be because of their genes. 3 And even though some kids gain weight more easily than others, when they eat right and exercise, most kids can be a healthy and happy weight that"s right for them. It"s true the way you live can change the way you look. How much you weigh is a balance between the calories you eat and the calories you use. 4 If you spend your free time watching TV, your body won"t use as many calories as it would if you played basketball, skated, or went for a walk. If you are in balance, your weight will stay fight for you as you grow. But if you eat more and exercise less, you may become overweight. 5 A. That"s why it"s possible for two kids with the same height, but different weights, to both be the right weight. B. If you eat more calories than your body needs to use, you will gain too much weight. C. Poor eating and exercise habits also run in families and this may be the reason the members of a family are overweight. D. However, many overweight people have difficulty reaching their healthy body weight. E. On the other hand, if you eat less and exercise more, you may lose weight. F. If both your parents are tall, there is a good chance you"ll be tall.

填空题A. that may cause our blood vessels to become more and more narrowB. for pregnant women to take during their last six monks of pregnanciesC. that their likelihood to suffer major problems is two times higher than other babiesD. their doctors about how to treat their problemsE. because diabetes during pregnancy may sometimes lead to birth defectsF. though their mothers took ACE inhibitors during their first three months of pregnancies

填空题 U.S., European Drug Officials Approve Inhaled Insulin A form of insulin for people with diabetes to take by mouth is expected to be sold within a few months. The new medicine is called Exubera. The United States Food and Drug Administration: and the European Commission both recently approved it for adults. It could make life easier for many diabetics who require daily injections of insulin to control their blood sugar levels. But it will not replace all insulin injections. And it is not for everyone. People who smoke or have stopped smoking for less than six months should not take Exubera. (46) Three drug companies -- Pfizer, Sanofi-Aventis and Nektar Therapeutics -- developed the inhaled insulin. (47) Experts say about fifteen percent of diabetics who need insulin do not take it. The treatment can involve several injections each day. Insulin is a hormone that the body uses to change food into energy. Failure to control blood sugar levels can lead to serious problems, including blindness and loss of blood flow to the feet. It can also lead to heart disease, stroke and kidney failure4. Insulin has been sold as a drug since the nineteen twenties. This is the first new way to take it. Exubera uses a powder breathed into the lungs through a mouthpiece. Pfizer will study the long-term effects. It says some patients have reported a mild cough while using the inhaled insulin. (48) . Many people do not know they have diabetes. There are two forms. Most diabetics have the Type Two form. Their body does not make enough insulin or cannot effectively use the insulin it produces. (49) Most Type Two diabetics do not take insulin. Their medicines can be taken by mouth. Diet, exercise and weight control are also important. Type One diabetes often begins in childhood. (50) . Officials say diabetics with either type could use inhaled insulin, either before or after a meal. But Type One diabetics and some with Type Two would still need a longer-lasting injection at least once a day.A. With this type the body is unable to produce insulin.B. Pfizer recently bought the rights to sell it worldwide.C. The control of their blood sugar levels is most important for patients with diabetes.D. It is common in people who are overweight and not active.E. Some patients with lung disease should not take it either.F. People are advised to have their lungs examined before using Exubera, and at least once a year after that.

填空题Einstein Named "Person of Century" Albert Einstein, whose theories on space time and matter helped unravel the secrets of the atom and of the universe, was chosen as "Person of the Century" by Time magazine on Sunday. A man whose very name is synonymous with scientific genius, Einstein has come to represent 1 the flowering of 20th century scientific thought that set the stage for the age of technology. "The world has changed far more in the past 100 years than in any other century in history. The reason is not political or economic, but technological—technologies 2 ," wrote theoretical physicist Stephen Hawking in a Time essay explaining Einstein"s significance. "Clearly, no scientist better represents those advances than Albert Einstein." Time chose as runner-up President Franklin Roosevelt to represent the triumph of freedom and democracy over fascism, and Mahatma Gandhi as an icon for a century when civil and human rights became crucial factors in global politics. "What we saw Franklin Roosevelt embodying the great theme of freedom"s fight against totalitarianism, Gandhi personifying the great theme of individuals struggling for their rights, and Einstein being both a great genius and a great symbol of a scientific revolution that brought with it amazing technological advances 3 ," said Time magazine editor Walter Isaacson. Einstein was born in Ulm, Germany in 1879. In his early years, Einstein did not show the promise of what he was to become. He was slow to learn to speak and did not do well in elementary school. He could not stomach organized learning and loathed taking exams. In 1905, however, he was to publish a theory which stands as one of the most intricate examples of human imagination in history. In his "Special Theory of Relativity," Einstein described bow the only constant in the universe is the speed of light. Everything else—mass, weight, space, even time itself—is a variable. And he offered the world his now-famous equation: energy equals mass times the speed of light squared—E=mc 2 . "Indirectly, relativity paved the way for a new relativism in morality, art and politics," Isaacson wrote in an essay 4 . There was less faith in absolutes, not only of time and space but also of truth and morality. Einstein"s famous equation was also the seed that led to the development of atomic energy and weapons. In 1939, six years after he fled European fascism and settled at Princeton University, Einstein, an avowed pacifist, signed a letter to President Roosevelt urging the United States to develop an atomic bomb before Nazi Germany did. Roosevelt heeded the advice and formed the "Manhattan Project" 5 . Einstein did not work on the project. Einstein died in Princeton, New Jersey, in 1955. A. explaining Time"s choices B. how he thought of the relativity theory C. more than any other person D. that secretly developed the first atomic weapon E. that flowed directly from advances in basic science F. that helped expand the growth of freedom

填空题下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。 Ludwig Van Beethoven Ludwig Van Beethoven, a major composer of the nineteenth century, overcame many personal problems to achieve artistic greatness. Born in Bonn, Germany, in 1770, he first studied music with the court organist, Gilles van der Eeden. His father was excessively strict and given to heavy drinking. {{U}}(46) {{/U}} Appointed deputy court organist to Christian Gottlob Neefe at a surprisingly early age in 1782, Beethoven also played the harpsichord and the viola. In 1792 he was sent to Vienna by his patron, Count Ferdinand Waldstein, to study music under Haydn. Beethoven remained unmarried. {{U}}(47) {{/U}} Continually plagued by ill health, he developed an ear infection which led to his tragic deafness in 1819. {{U}} (48) {{/U}} He completed mature masterpieces of great musical depth: three piano sonatas, four string quartets, the Missa Solemnis, and the 9th Symphony. He died in 1827. {{U}}(49) {{/U}} Noting that Beethoven often flew into fits of rage, Goethe once said of him, "I am astonished by his talent, but he is unfortunately an altogether untamed personality. " {{U}}(50) {{/U}} A. In spite of this handicap, however, he continued to write music B. Because of irregular payments from his publishers and erratic support from his patrons, he was troubled by financial worries throughout his adult life C. His life was marked by a passionate dedication to independence D. When his mother died, Beethoven, then a young man, was named guardian of his two younger brothers E. Although Beethoven's personality may have been untamed, his music shows great discipline and control, and this is how we remember him best F. Today his music is still being played all over the world

填空题A. must be very boringB. some kind of recreationC. participating in themD. to relax oneselfE. to choose one' s own way of relaxingF. maintain good health

填空题Mobile Phones Mobile phones should carry a label if they proved to he a dangerous source of radiation, according to Robert Bell, a scientist. And no more mobile phone transmitter towers should he build until the long-term health effects of the electromagnetic (电磁的) radiation they emit is scientifically evaluated, he said. "Nobody's going to drop dead overnight but we should be asking for more scientific information, " Robert Bell said at a conference on the health effects of low-level radiation. (46) A report widely circulated (传播) among the public says that up to now scientists do not really know enough to guarantee there are no ii1 effects on humans from electromagnetic radiation. According to Robert Bell, there are 3.3 million mobile phones in Australia alone and they are increasing by 2,000 a day. (47) As well, there are 2, 000 transmitter towers around Australia, many in high density (密度) residential areas. (48) The electromagnetic radiation emitted from these towers may have already produced some harmful effects on the health of the residents nearby. Robert Bell suggests that until more research is completed the government should ban construction of phone towers from within a 500-metre radius of school grounds, child care centres, hospitals, sports playing fields (隔离屏) and residential areas with a high percentage of children. (49) He adds that there is also evidence that if cancer sufferers are subjected to electromagnetic waves the growth rate of the disease accelerates (加速，加快). (50) According to Robert Bell, it is reasonable for the major telephone companies to fund it. Besides, he also urges the government to set up a wide ranging inquiry into possible health effects.A. He says there is emerging evidence that children absorb low-level radiation at a rate more than three times that of adults.B. By the year 2000 it is estimated that Australia will have 8 million mobile phones: nearly one for every two peopleC. "If mobile phones are found to be dangerous, they should carry a warning label until proper shields can be devised," he said.D. Then who finances the research?E. For example, Telstra, Optus and Vodaphone build their towers where it is geographically suitable to them and disregard (不顾) the need of the community.F. The conclusion is that mobile phones brings more harm than benefit.

填空题3. Brands The word brand is a comprehensive term that encompasses (包含) other narrower terms. (46) A brand differentiates one seller' s products from those of competitors. A brand name consists of words, letters, and/or numbers that can be vocalized. A brand mark is the part of the brand that appears in the form of a symbol, design, or distinctive coloring or lettering. (47) A trademark is a brand that is given legal protection because, under the law, it has been appropriated by one seller. (48) All trademarks are brands and thus include the words, letters, or numbers that can be pronounced. They may also include a pictorial design. Some people erroneously believe that the trademark is only the pictorial part of the brand. One major method of classifying brands is on the basis of who owns them - producers or middlemen. (49) The terms national and private have been used to describe producer and middleman brand ownership, respectively. (50) To say that the brand of poultry (家禽) feed marketed in three states by a small Birmingham, Alabama, manufacturer is a national brand, whereas the brands of Penney' s or Sears are private brands, stretches the meaning of the terms national and private.A. It is recognized by sight but may not be expressed when a person pronounces the brand name.B. Thus trademark is essentially a legal term.C. However, marketing people prefer the producer middleman terminology.D. A brand is a name, term, symbol, and/or special design that is intended to identify the goods or services of one seller or group of sellers.E. Sunbeam, Florsheim, Spalding (athletic products), and Sara Lee are producers' brands, while Allstate, Shurfine, Sysco, Craftsman, and Penncrest are middlemen' s brands.F. Among various methods of classifying brands, the one based on ownership is widely accepte

填空题 阅读下面的短文，文章中有5处空白，文章后面有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。 {{B}} The First Four Minutes{{/B}} When do people decide whether or not they want to become friends? During their first four minutes together, according to a book by Dr. Leonard Zunin. In his book, Contact: The first four minutes, he offers this advice to anyone interested in starting new friendships: "{{U}} (46) {{/U}} A lot of people's whole lives would change if they did just that." You may have noticed that the average person does not give his undivided attention to someone he has just met. {{U}}(47) {{/U}} If anyone has ever done this to you, you probably did not like him very much. When we are introduced to new people, the author suggests, we should try to appear friendly and self-confident. In general, he says, "People like people who like themselves." On the other hand, we should not make the other person think we are too sure of ourselves. It is important to appear interested and sympathetic, realizing that the other person has his own needs, fears, and hopes. Hearing such advice, one might say, "But I'm not a friendly, self-confident person. That's not my nature. It would be dishonest for me to act that way." {{U}} (48) {{/U}} We can become accustomed to any changes we choose to make in our personality. "It is like getting used to a new car. It may be unfamiliar at first, but it goes much better than the old one." But isn't it dishonest to give the appearance of friendly self-confidence when we don't actually feel that way? Perhaps, but according to Dr. Zunin, "total honesty" is not always good for social relationships2, especially during the first few minutes of contact. There is a time for everything, and a certain amount of play-acting may be best for the first few minutes of contact with a stranger. That is not the time to complain about one's health or to mention faults one finds in other people. It is not the time to tell the whole truth about one's opinions and impressions. {{U}} (49) {{/U}} For a husband and wife or a parent and child, problems often arise during their first four minutes together after they have been apart. Dr. Zunin suggests that these first few minutes together be treated with care. If there are unpleasant matters to be discussed, they should be dealt with later. The author says that interpersonal relations should be taught as a required courses in every school, along with reading, writing, and mathematics. {{U}}(50) {{/U}} That is at least as important as how much we know.A. In reply, Dr. Zunin would claim that a little practice can help us feel comfortable about changing our social habits.B. Much of what has been said about strangers also applies to4 relationships with family members and friends.C. In his opinion, success in life depends mainly on how we get along with other people.D. Every time you meet someone in a social situation, give him your undivided attention for four minutes.E He keeps looking over the other person's shoulder, as if hoping to find someone more interesting in another part of the room.F He is eager to make friends with everyone.

填空题 阅读下面的短文，文章中有5处空白，文章后有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。 Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper,{{U}} (46) {{/U}}. When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will slow and become quite regular. Your brain waves slow down a bit too, with the alpha rhythm of rather fast waves predominating for the first few minutes.{{U}} (47) {{/U}}. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep,{{U}} (48) {{/U}}. Then, about 40 to 60 minutes after you lose consciousness, you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep. You do not remain at this deep fourth stage all night long, but instead about 80 minutes after you fall into slumber,{{U}} (49) {{/U}}. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep.{{U}} (50) {{/U}}. Provided that you do not wake up during the first REM sleep period, your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep--only to rise once again to the surface of near consciousness some 80 minutes later. A. your brain activity level will increase again slightly. B. The slower your brain waves will be. C. Your brain is still working when you are sleeping. D. Your sleep cycle is as follows. E. It is during REM sleep that most dreams seem to occur. F. This is called stage i sleep.

填空题Facts about Stroke 1 Every 45 seconds, someone in America has a stroke. Every 3.1 minutes, someone dies of one. Stroke killed an estimated 167,661 people in 2000 and is the nation"s third leading cause of death, ranking behind diseases of the heart and all forms of cancer. Stroke is a leading cause of serious, long-term disability in the United States. 2 Stroke is a type of cardiovascular (心血管的) disease. It affects the arteries (动脉) leading to and within the brain A stroke occurs when a blood vessel that carries oxygen and nutrients (营养物) to the brain is either blocked by a clot (凝块) or bursts. When that happens, part of the brain cannot get the blood (and oxygen) it needs, so it starts to die. 3 The brain is an extremely complex organ that controls various body functions. If a stroke occurs and blood flow can"t reach the region that controls a particular body function, that part of the body won"t work as it should. If the stroke occurs toward the back of the brain, for instance, it"s likely that some disability involving vision will result. The effects of a stroke depend primarily on the location of the obstruction (阻塞) and the extent of brain tissue affected. 4 The American Stroke Association has identified several factors that increase the risk of stroke. The more risk factors a person has, the greater the chance that he or she will have a stroke. Some of these you can"t control, such as increasing age, family health history, race, and prior stroke. But you can change or treat other risk factors to lower your risk. Factors resulting from lifestyle or environment can be modified with a healthcare provider"s help. Some of these include: high blood pressure, current smoking, heart disease, and high red blood cell count. 5 A stroke can happen to anyone at any moment. In fact about 600,000 people have strokes every year. For many years, there was no hope for those suffering a stroke. However, recent breakthroughs have led to new treatments. For the treatments to work, the person must get to a hospital immediately.

填空题Depression and the Elderly 1 We all feel sad at times. However, clinical depression is a serious matter. Clinical depression, sometimes called major depression, is a biologically based brain disorder that affects one's thoughts, feelings, behavior, and physical health. When people complain that they feel terrible, they have no interest or take no pleasure in things, have trouble sleeping, lack energy, have poor appetite, or cannot concentrate, depression is a definite possibility. 2 Depression in its many forms affects more than 6.5 million of the 35 million Americans who are 65 years or older. Most older people with depression have been suffering from episodes (发作) of the illness during much of their lives. For others, depression has a first onset (起病) in late life - even for those in their 80s and 90s. Depression in older persons is closely associated with dependency and disability and causes great suffering for the individual and the family. 3 Many older people and their families don't recognize the symptoms of depression, aren't aware that it is a medical illness, and don't know how it is treated Others may mistake the symptoms of depression as signs of dementia (痴呆). Also, many older people think that depression is a character flaw (缺陷) and are worried about being stigmatized (给...带来耻辱), so they blame themselves for their illness and are too ashamed (羞耻的) to get help. Others worry that treatment would be too costly. 4 Older persons with depression rarely seek treatment for the illness. Unrecognized and untreated depression has fatal consequences in terms of both suicide and non-suicide mortality (死亡率). The highest rate of suicide in the US is among older white men. Depression is the single most significant risk factor for suicide in that population. Tragically, many of those people who go on to commit suicide have reached out for help — 20% see a doctor the day they die, 40% the week they die, and 70% in the month they die. Yet depression is frequently missed.

填空题 阅读下面的短文，文章中有5处空白，文章后面有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。 {{B}}Weight Worries May Start Early for Slim Women{{/B}} There is a range of reasons why thin women think they're too heavy, but the distorted body image may often have its roots in childhood, the results of a new study suggest. Researchers found that among more than 2,400 thin women they surveyed, nearly 10 percent thought they were too heavy. {{U}}(46) {{/U}} According to the study authors, led by Dr. Susanne Kruger Kjaer of the Danish Cancer Society, Copenhagen, society's "ideal" female body is moving toward an underweight physique. {{U}}(47) {{/U}} To investigate body image among thin women, the researchers gave questionnaires to 2,443 women ages 27 to 38 whose body mass index was at the low end of normal. {{U}}(48) {{/U}} Overall, almost 10 percent of the women thought they were too heavy. Those who reported certain "severe life events" in childhood or adolescence, such as having a parent become ill or having their educational hopes dashed, were more likely than others to have a distorted body image. {{U}}(49) {{/U}} In contrast, traumatic events in adulthood, such as serious illness or significant marital problems, were not related to poor body image, the researchers report. {{U}}(50) {{/U}}A The same was true of4 women who started having sex or drinking alcohol when they were younger than 15 years old.B Experiences in childhood, including having an ill parent, or starting to drink or have sex at a particularly young age, were among the risk factors for having a distorted body image.C "Our results indicate that the risk of being dissatisfied with (one's) own body weight may be established early in life," Kjaer and her colleagues write.D Research suggests that many normal-weight women wish to weigh less.E If worries have altered your appetite or weight, it will help to talk to someone about it.F The women were asked about factors ranging from childhood experiences to current exercise habits.

填空题Depression and the Elderly We all feel sad at times. However, clinical depression is a serious matter. Clinical depression, sometimes called major depression, is a biologically based brain disorder that affects one"s thoughts, feelings, behavior, and physical health. When people complain that they feel terrible, they have no interest or take no pleasure in things, have trouble sleeping, lack energy, have poor appetite, or cannot concentrate, depression is a definite possibility. Depression in its many forms affects more than 6.5 million of the 35 million Americans who are 65 years or older. Most older people with depression have been suffering from episodes (发作) of the illness during much of their lives. For others, depression has a first onset (起病) in late life—even for those in their 80s and 90s. Depression in older persons is closely associated with dependency and disability and causes great suffering for the individual and the family. Many older people and their families don"t recognize the symptoms of depression, aren"t aware that it is a medical illness, and don"t know how it is treated. Others may mistake the symptoms of depression as signs of dementia (痴呆). Also, many older people think that depression is a character flaw (缺陷) and are worried about being stigmatized (给……带来耻辱). So they blame themselves for their illness and are too ashamed (耻辱的) to get help, others worry that treatment would be too costly. Older persons with depression rarely seek treatment for the illness. Unrecognized and untreated depression has fatal consequences in terms of both suicide and non-suicide mortality (死亡). The highest rate of suicide in the US is among older white men. Depression is the single most significant risk factor for suicide in that population. Tragically, many of those people who go on to commit suicide have reached out for help. 20% see a doctor the day they die, 40% the week they die, and 70% in the month they die. Yet depression is frequently missed.

填空题Anti-aging Secrets: Four Ways to Stay Young 1 The aging process is not easy for anyone. While some people accept getting older and do everything within their power to keep the mind and body active, others adopt a negative attitude and give in to the effects of aging. However, the key to feeling young is maintaining a young mental state. Moreover, simple lifestyle changes can make you feel years younger. 2 Keeping the mind active is the best medicine against aging. Studies have shown that persons who remain active following retirement live longer. Brainpower and physical fitness go hand-in-hand. When minds are sharpened or active, we are more likely to be physically active. Even if aging results in slight memory loss or a little confusion, brain exercises such as crossword puzzles (填字字谜) can improve memory. 3 Some persons are naturally introverted (内倾性格的) or shy, which can result in isolation. If you want to live a long life, avoid isolation. Maintaining healthy relationships has lasting benefits. Establishing strong relationships could lower blood pressure, promote relaxation, ease pain, and may even strengthen the immune system (免疫系统). 4 Too much stress can quickly age people. Completely ridding (使摆脱) our lives of stress is impossible. On the other hand, we can adopt simple techniques for better coping with life"s problems, including reducing chaos, setting realistic goals, and relaxing. 5 If you think that you are old, you feel old. Try to be cheerful and avoid developing a negative attitude towards life. Sometimes, this involves changing our association. Surrounding yourself with complainers will start to influence your attitude to life. We all experience hardships. Rather than focusing on the Unpleasant, reflect on the positive things about life.

填空题 下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～7段名其中4段选择1个最佳标题；(2)第27～30题要求从所给的6个选项中为每个句子确定1个最佳选项。 {{B}}Screen Test{{/B}}1．Every year millions of women are screened with X-rays to pick up signs of breast cancer. If this happens early enough, the disease can often be treated successfully. According to a survey published last year，21 countries have screening programmes. Nine of them, including Australia, Canada, the US and Spain, screen women under 50.2．But the medical benefits of screening these younger women are controversial，partly because the radiation brings a small risk of inducing cancer. Also, younger women must be given higher doses of X-rays because their breast tissue is denser.3．Researchers at the Polytechnic University of Valencia analysed the effect of screening more than 160,000 women at 11 local clinics. After estimating the women's cumulative dose of radiation, they used two models to calculate the number of extra cancers this would cause.4．The mathematical model recommended by Britain's National Radiological Protection Board(NR- PB)predicted that the screening programme would cause 36 cancers per 100,000 women,18 of them fatal. The model preferred by the UN Scientific Committee on the Effects of Atomic Radiation led to a lower figure of 20 cancers.5．The researchers argue that the level of radiation-induced cancers is "not very significant" compared to the far larger number of cancers that are discovered and treated. The Valencia programme，they say，detects between 300 and 450 cases of breast cancer in every 100,000 women screened.6．But they point out that the risk of women contracting cancer from radiation could be reduced by between 40 and 80 percent if screening began at 50 instead of 45,because they would be exposed to less radiation. The results of their study, they suggest, could help "optimize the technique" for breast cancer screening.7．"There is a trade-off between the diagnostic benefits of breast screening and its risks." admits Michael Clark of the NRPB. But he warns that the study should be interpreted with caution."0n the basis of the current data, for every 10 cancers successfully detected and prevented there is a risk of causing one later in life. That's why radiation exposure should be minimized in any screening programme.

填空题Watching Microcurrents Flow We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic field generated as electric currents flow through objects, physicists have managed (46) . The technology will allow manufacturers to scan microchips for faults, as well as revealing microscopic defects in anything from aircraft to banknotes. Gang Xiao and Ben Schrag at Brown University in Providence, Rhode Island, visualize the current by measuring subtle changes in the magnetic field of an object and (47) Their sensor is adapted from an existing piece of teclmology that is used to measure large magnetic fields in computer hard drives. "We redesigned the magnetic sensor to make it capable of measuring very weak changes in magnetic fields," says Xiao. The resulting device is capable of detecting a current as weak as 10 microamperes, even when the wire is buried deep within a clip, and it shoves up features as small as 40 nanometers across. At present, engineers looking for defects in a chip have to peel off the layers and examine the circuits visually; this is one of the obstacles (48) . But the new magnetic microscope is sensitive enough to look inside chips and reveal faults such as short circuits, nicks in the wires or electro migration where a dense area of current picks up surrounding atoms and moves them along. "It is like watching a river flow," explains Xiao. As well as scanning tiny circuits, the microscope can be used to reveal the internal structure of any object capable of conducting electricity. For example, it could look directly at microscopic cracks in an aero-plane's fuselage, (49) . The technique cannot yet pick up electrical activity in the human brain because the current there is too small, but Xiao doesn't rule it out in the future. "I can never say never," ha says. Although the researchers have only just made the technical details of the microscope public, it is already on sale, from electronics company Micro Magnetics in Fall River, Massachusetts. It is currently the size of a refrigerator and takes several minutes to scan a circuit, but Xiao and Schrag are working (50) . A. to shrink it to the size of a desktop computer and cut the scanning time to 30 seconds B. to making chips any smaller C. to take tiny chips we require D. to picture the progress of the currents E. converting the information into a color picture showing the density of current at each point F. faults in the metal strip of a forged banknote or bacteria in a water sample

填空题A. will influence future climate changeB. was somewhat surprisingC. will rise rapidlyD. was known to U.S. allE. was much higher than had been expectedF. will drop dramatically