单选题The books interest businessmen profoundly.A. likelyB. solelyC. sharplyD. deeply

单选题Diseases of Agricultural Plants Plants, like animals, are subject to diseases of various kinds. It has been estimated that some 30,000 different diseases attack our economic plants; forty are known to attack corn, and about as many attack wheat. The results of unchecked plant disease are all too obvious in countries which have marginal food supplies. The problem will soon be more widespread as the population of the world increases at its frightening rate. Even in countries which are now amply fed by their agricultural products there could soon be critical food shortages. It is easy to imagine the consequences of some disastrous attack on one of the major crops; the resulting famines could kill millions of people, and the resulting hardship on other millions could cause political upheavals disastrous to the order of the world. Some plants have relative immunity to a great many diseases, while others have a susceptibility to them. The tolerance of a particular plant changes as the growing conditions change. A blight may be but a local infection easily controlled; on the other hand it can attack particular plants in a whole region or nation. An example is the blight which killed virtually every chestnut tree in North America. Another is the famous potato blight in Ireland in the last century. As a result of that, it was estimated that one million people died of starvation and related ailments. Plant pathologists have made remarkable strides in identifying the pathogens of the various diseases. Bacteria may invade a plant through an infestation of insect parasites carrying the pathogen. A plant can also be inoculated by man. Other diseases might be caused by fungus which attacks the plant in the form of a mold or smut or rust. Frequently such a primary infection will weaken the plant so that a secondary infection may result from its lack of tolerance. The symptoms shown may cause an error in diagnosis, so that treatment may be directed toward bacteria which could be the result of a susceptibility caused by a primary virus infection.

单选题Which of the following is the best title for the passage?

单选题A great deal has been done to remedy the situation.

单选题TIME B. It's the advertising edition of TIME Magazine directed {{U}}exclusively{{/U}} to businessmen.

单选题Migrant Workers In the past twenty years, there has been an increasing tendency for workers to move from one country to another. (51) some newly independent countries have understandably restricted most jobs to local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East, (52) increased oil incomes have enabled many countries to (53) outsiders to improve local facilities. (54) the Middle East has attracted oil-workers from the USA and Europe. It has brought in construction workers and technicians from many countries, (55) South Korea and Japan. In view of the difficult living and working conditions in the Middle East, it is not (56) that the pay is high to attract suitable workers. Many engineers and technicians can earn at least (57) money in the Middle East as they can in their own country, and this is a major attraction. An allied benefit is the low taxation or complete lack of it. This increases the net amount of pay received by visiting workers and is very popular with them. Sometimes a disadvantage has a compensating advantage. (58) , the difficult living conditions often lead to increased friendship when workers have to depend on each other (59) safety and comfort. (60) , many migrant workers can save large sums of money partly (61) the lack of entertainment facilities. The work is often complex and full of problems but this merely presents greater challenge to engineers who prefer to find solutions (62) problems rather than do routine work in their home country. One major problem which (63) migrant workers in the Middle East is that their jobs are temporary ones. They are nearly always on contract, so it is not easy for them to plan ahead with great confidence. This is to be expected since no country welcomes a large number of foreign workers as permanent residents. (64) , migrant workers accept this disadvantage, along with others, because of the (65) financial benefits which they receive.

单选题I think the new {{U}}strategy{{/U}} our manager came up with won't work in the market. A. manner B. battle C. management D. tactic

单选题Water is one of the most Uabundant/U but also one of the most wanted substances on Earth.

单选题It was a fascinating painting, with clever use of color and light.

单选题Some animals pant and {{U}}sweat{{/U}} to speed evaporation of body moisture and thus cool themselves.

单选题 下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 {{B}}Health Care in the US{{/B}} Health care in the US is well-known but very expensive. Paying the doctor's bill after a major illness or accident can cost hundreds of thousands of dollars. In the US, a person's company, not the government, pays for health insurance. Employers have contracts with insurance companies, which pay for all or part of employees' doctors' bills. The amount that the insurance company will pay out to a patient differs wildly. It all depends on what insurance the employer pays. The less the boss pays to the insurance company, the more the employee has to pay the hospital each time he or she gets sick. In 2004, the average worker paid an extra US$558 a year, according to a San Francisco report. The system also means many Americans fall through the cracks (遭遗漏). In 2004, only 61 per cent of the population received health insurance through their employers, according to the report. The unemployed, self-employed, part-time workers and graduated students with no jobs were not included. Most US university students have a gap between their last day of school and their first day on the job. Often, they are no longer protected by their parents' insurance because they are now considered independent adults. They also cannot buy university health insurance because they are no longer students. Another group that falls through the gap of the US system is international .students. All are required to have health insurance and cannot begin their classes without it. But exact policies (保险单) differ from school to school. Most universities work with health insurance companies and sell their own standard plan for students. Often, buying the school plan is required, but luckily it's also cheaper than buying direct from the insurance company.

单选题Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.

单选题In 1861, it seemed inevitable that the Southern states would break away from the Union.

单选题 A Gay Biologist Molecular biologist Dean Hamer has blue eyes, light brown hair and a good sense of humor. He smokes cigarettes, spends long hours in an old laboratory at the U.S. National Institute of Health, and in his free time climbs up cliffs and points his skis down steep slopes. He also happens to be openly, matter-of-fact gay. What is it that makes Hamer who he is? What, for that matter, accounts for the talents and traits that make up anyone's personality? Hamer is not content merely to ask such questions; he is trying to answer them as well. A pioneer in the field of molecular psychology, Hamer is exploring the role genes play in governing the very core of our individuality. To a remarkable extent, his work on what might be called the gay, thrill-seeking and quit-smoking genes reflects how own genetic predispositions. That work, which has appeared mostly in scientific journals, has been gathered into an accessible and quite readable form in Hamer's creative new book, Living with Our Genes. "You have about as much choice in some aspect of your personality," Hamer and coauthor Peter Copeland write in the introductory chapter, "as you do in the shape of your nose or the size of your feet." Until recently, research into behavioral genetics was dominated by psychiatrists and psychologists, who based their most compelling conclusions about the importance of genes on studies of identical twins. For example, psychologist Michael Bailey of Northwestern University famously demonstrated that if one identical twin is gay, there is about a 50% likelihood that the other will be too. Seven years ago, Hamer picked up where the twin studies left off, homing in on specific strips of DNA that appear to influence everything from mood to sexual orientation. Hamer switched to behavioral genetics from basic research, after receiving his doctorate from Harvard, he spent more than a decade studying the biochemistry of a protein that cells use to metabolize heavy metals like copper and zinc. As he was about to turn 40, however, Hamer suddenly realized he had learned as much about the protein as he cared to. "Frankly, I was bored," he remembers, "and ready for something new." Homosexual behavior, in particular, seemed ripe for exploration because few scientists had dared tackle such an emotionally and politically charged subject. "I'm gay," Hamer says with a shrug, "but that was not a major motivation. It was more of a question of intellectual curiosity—and the fact that no one else was doing this sort of research."

单选题Medicine depends on other fields for basic information, particularly some of their specializec branches. A. conventionally B. obviously C. especially D. inevitably

单选题Happy Marriage, Happy Heart Happily married people have lower blood pressure (51) unhappily married people or singles, a Brigham Young University study says. On the other hand, even having a supportive social network did not translate into a blood pressure benefit for singles or unhappily (52) people, according to the study. "There seem to be some unique health benefits from marriage. It's not just being married (53) benefits health-what's really the most protective of health is having a happy (54) ," study author Julianne Holt-Lunstad, a psychologist who specializes in relationships and health, said in a prepared statement. The study included 204 married and 99 (55) adults who wore portable blood-pressure monitors for 24 hours. The (56) recorded blood pressure at random intervals and provided a total of about 72 readings. "We wanted to capture participants' blood pressure doing whatever they normally (57) in everyday life. Getting one or two readings in a clinic is not really (58) of the fluctuations that occur throughout the day," Holt-Lunstad said. Overall, happily married people scored four points (59) on the blood pressure readings than single adults. The study also found that blood (60) among married people especially those in happy marriages (61) more during sleep than in single people. "Research has shown that people whose blood pressure remains high throughout the night are at (62) greater risk of heart disease than people whose blood pressure drops," HoltLunstad said. The study was published in the March 20 (63) of the journal Annals of Behavioral Medicine. The study also found that unhappily married adults have higher blood pressure than (64) happily married and single adults. Holt-Lunstad noted that married couples can encourage healthy habits in one (65) ,such as eating a healthy diet and having regular doctor visits. People in happy marriages also have a source of emotional support, she said.

单选题Mosquitoes generally breed in swampy areas.A. alwaysB. usuallyC. rarelyD. never

单选题His idea to solve the problem is really original .

单选题Polycarbonate Products Issues A line of water bottles that had become a symbol of environmental responsibility has been removed from the shelves of Canada"s leading outdoor gear retailer over concerns about a chemical used in its manufacture. The Mountain Equipment Co-op, which is based in Vancouver, British Columbia, removed the bottles, sold under the brand name Nalgene, and other polycarbonate containers from its 11 large-scale stores on Wednesday. The retailer said that it would not restock the bottles, which are made by Nalge Nunc International in Rochester, a unit of Thermo Fisher Scientific, until Health Canada completed a review of bisphenol-a, or B.P.A., a chemical used to make hard, transparent plastics as well as liners for food cans. "We"ve been following the B.P.A. issue for at least three years," said Tim Southam, a spokesman for Mountain Equipment. "The decision we"ve taken this week does not mean that polycarbonate products will never return to our stores. We"re just seeking some certainty about this chemical." Church and environmental groups in Canada have mounted campaigns against bottled water because of concerns about the huge amount of plastic used in containers. As a result, the reusable Nalgene bottles have become ubiquitous on college campuses and elsewhere. Polycarbonate plastic, which can only be produced by using B.P.A., creates bottles that are transparent and almost as hard as glass, but particularly shatter-resistant. Recently, however, the use of B.P. A.-based plastics in food containers has been questioned in Canada by Environmental Defence, a Toronto-based group. Environmentalists in the United States are also raising concerns about the chemical. Last year, San Francisco"s board of governors passed a local law banning the use of the chemical in children"s products. B.P.A. was removed from the ordinance before it went into effect, however, after an industry lawsuit. Critics point to studies dating back to 1936 showing that the chemical can disrupt the hormonal system. While there is little dispute about that, the plastics industry, supported by several studies from government agencies in Japan, North America and Europe，contends that polycarbonate bottles contain very little of the chemical and release only insignificant amounts of B.P.A. into the bodies of users. "Rarely has a chemical been the subject of such intense scientific testing and scrutiny, and still, important agencies across the globe agree that there is no danger posed to humans from polycarbonate bottles," Tom Cummins, the director of research and development at Nalge Nunc, said in a statement. Rick Smith, the executive director of Environmental Defence, said that a paper published by 38 scientists after a government-sponsored conference in the United States found that the lack of research on the effects of B.P.A. on humans was a concern that required further investigation. Steven G. Hentges, the executive director of the American Chemistry Council"s polycarbonate group, takes issue with that report"s worries and points to a separate expert panel report published by the United States Department of Health and Human Services last month. In its 396-page report, which looked only at the impact of B.P.A. on reproduction, the panel said it had "negligible concern" about the chemical"s effect on adult reproductive systems but raised some concerns about its impact on children and pregnant women.

单选题No one knew whether this expressed acceptance of his {{U}}fate{{/U}} or joy at his deliverance.