单选题More than one million Americans participated in the six-year study.

单选题The woman living next door is extremely {{U}}slender{{/U}}.

单选题Of the reptile groups, the snake group was the {{U}}final{{/U}} one to appear. A. last B. best C. ugliest D. longest

单选题{{B}}第二篇{{/B}} {{B}} FDA: Human, Animal Waste Threatens Produce{{/B}} The biggest food safety risk for fresh fruits and vegetables as they are grown, picked or processed comes from human and animal waste, the US Food and Drug Administration (FDA) said Friday. More than 9,000 Americans die each year from food-borne diseases and some scientists believe fresh produce is the biggest carrier of contamination. The FDA issued a set of draft guidelines for US and foreign growers to carefully monitor worker hygiene, water quality, manure management and transportation. This 34-page draft guidelines urged growers to give workers lessons on basic hygiene such as Using soap to wash their hands, covering wounds that could come into contact with produce, and using only clean toilets. The FDA guidelines identified "the major source of contamination" for fresh produce as human or animal feces. "We think just proper controls and proper attention to detail would make a big difference in food safety," said an FDA official. "It is our belief that these guidelines would not be very costly. " But grower groups disagreed with the FDA's assessment. "Most food-borne disease outbreaks that happen further down the distribution line are due to contamination because people preparing food are not properly washing their hands," said Stacey Zawal, an official with United Fresh Fruit and Vegetable Association. "That is not necessarily true for growers and packers. " Some US grower organizations have expressed concern that the agency is interfering with on- farm practices. 8 Others object to the FDA's proposal to have growers formally document the picking, handling and transportation of produce so that health officials could quickly recall foods if necessary. Consumer groups criticized the FDA guidelines as of little use because they will not carry the force of law to But stricter regulations could evolve as researchers find new technology or methods to kill harmful bacteria or parasites, the FDA said. The FDA recommendations are due to be made final by the FDA later this year for use by US and foreign growers. The matter of encouraging foreign growers to adopt the guidelines remains somewhat tricky but FDA officials say it is vital because of the huge amount of imported produce.

单选题Mary said Umildly/U that she was just curious.

单选题 阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。 {{B}} Coming Soon to a Theater near You!{{/B}} What are special effects? Do you enjoy movies that use a lot of special effects? Dinosaurs (恐龙) from the distant past! Space battles from the distant future! There has been a revolution in special effects, and it has transformed the movies we see. The revolution began in the mid-1970s with George Lucas's Star Wars, a film that stunned (使震惊) audiences. That revolution continues to the present with dramatic changes in special effects technology. The company behind these changes is Lucas's Industrial Light Magic (ILM). And the man behind the company is Dennis Muren, who has worked with Lucas since Star Wars. Muren's interest in special effects began very early. At the age of 6, he was photographing toy dinosaurs and spaceships. At 10, he had an 8-millimeter movie camera and was making these things move through stop-motion. (Stop-motion is a process in which objects are shot with a camera, moved slightly, Shot again, and so on. When the shots are put together, the objects appear to move.) Talk to Muren and you'll understand what ILM is all about; taking on new challenges. By 1989, Muren decided he had pushed the old technology as far as it would go. He saw computer graphics(图像)(CG)technology as the wave of the future and took a year off the master it. With CG technology, images can be scanned into a computer for processing, for example, and many separate shots can be combined into a single image. CG technology has now reached the point, Muren says, where special effects can be used to do just about anything so that movies can tell stories better than ever before. The huge success of Jurassic Park and its sequel (续集), The Lost World, the stars of which were computer-generated dinosaurs, suggests that this may very well be true.

单选题Nerve signals may travel through nerve or muscle fibers at Uspeeds/U as high as two hundred miles per hour.

单选题Academic records from other institutions often become part of a university's official file and can neither be returned to a student nor {{U}}duplicated{{/U}}. A.borrowed B.purchased C.copied D.rewritten

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," Holt-Lunstad 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Most religions are concerned with the worship of one or several deities as well as with ethical rules of conduct.A. faithB. speechC. thoughtD. behavior

单选题The {{U}}normal{{/U}} price of a ticket for an adult is $230. A. ordinary B. proper C. fair D. medium

单选题______ the 2012 Olympic Games will be held in London is not known yet.A. WhetherB. IfC. WheneverD. That

单选题Avalanche and Its Safety An avalanche is a sudden and rapid flow of snow, often mixed with air and water, down a mountainside. Avalanches are 1 the biggest dangers in the mountains for both life and property. All avalanches are caused by an over-burden of material, typically snowpack, that is too massive and unstable for the slope 2 supports it. Determining the critical load, the amount of over-burden which is 3 to cause an avalanche, 4 a complex task involving the evaluation of a number of factors. Terrain slopes flatter than 25 degrees or steeper than 60 degrees typically have a low 5 of avalanche. Snow does not 6 significantly on steep slopes; also, snow does not 7 easily on flat slopes. Human-triggered avalanches have the greatest incidence when the snow"s angle of rest is 8 35 degrees and 45 degrees; the critical angle, the angle at which the human incidence of avalanches is greatest, is 38 degrees. The rule of thumb is: A slope that is 9 enough to hold snow but steep enough to ski has the potential to generate an avalanche, regardless of the angle. Additionally, avalanche risk increases with 10 that is, the more a slope is disturbed by skiers, the more likely it is that an avalanche will occur. Due to the complexity of the subject, winter travelling in the backcountry is never 100% safe. Good avalanche safety is a continuous 11 , including route selection and examination of the snowpack, weather 12 , and human factors. Several well- known good habits can also 13 the risk. If local authorities issue avalanche risk reports, they should be considered and all warnings should be paid 14 to. Never follow in the tracks of others without your own evaluations; snow conditions are almost certain to have changed since they were made. Observe the terrain and note obvious avalanche paths where plants are 15 or damaged. Avoid traveling below others who might trigger an avalanche.

单选题Life Expectancy in the Last Hundred Years A. hundred years ago, life expectancy in developed countries was about 47; in the early 2lst century, men in the United States and the United Kingdom can expect to live to about 74, women to about 80, and these (1) are rising all the time. What has brought (2) these changes? When we look at the life (3) of people 100 years ago, we need to look at the greatest (4) of the time. In the early 20th century, these were the acute and often (5) infectious diseases such as smallpox. Many children died very young from these diseases and others, and the weak and elderly were always at risk. In the (6) world these diseases are far (7) today, and in some cases have almost disappeared. A number of (8) have led to this: improvements in sanitation and hygiene, the discovery and use of antibiotics, which (9) bacterial diseases much less dangerous, and vaccinations (10) common diseases. (11) people's general health has improved with improvements in our general environment: cleaner air, better means of preserving food, better and warmer housing, and better understanding of nutrition. Genetically, we should all be able to live to about 85 but (12) people do live longer today, there are still some big killers around that are preventing us from consistently reaching that age. The problems that affect people today are the more chronic illnesses, such as heart disease and strokes, and those (13) by viruses, such as influenza and AIDS. Of course, cancer is a huge killer as well. In most cases these diseases affect (14) people, but there are worrying trends in the developed world with problems such as obesity (15) more heart disease and illnesses such as diabetes at younger ages. The killers today can be classed as "lifestyle diseases" , which means that it may be possible to halt their progress.

单选题Men of a certain age are always ready to talk about their fat problem.

单选题Shopping at Second-hand Clothing Stores　　 When 33-year-old Pete Barth was in college，shopping at second-hand clothing　stores was just something he did - “like changing the tires on his car.” He looked at his budget and decided he could save a lot of money by shopping for clothes at thrift shops.　　“Even new clothes are fairly disposable (可丢掉的)and wear out after a couple of years，” Barth said. “In thrift shops，you can find some great stuff whose quality is better than new clothes.”　　Since then，Barth，who works at a Goodwill thrift shop in the US state of Florida，has found that there are all kinds of reasons for shopping for second-hand clothing. Some people，like him，shop to save money. Some shop for a crazy-looking shirt. And some shop as a means of conserving energy and helping the environment.　　Pat Akins，an accountant at a Florida Salvation Army (SA)(救世军)thrift shop，said that，for her，shopping at thrift shops is a way to help the environment.　　“When my daughter was little，we looked at it as recycling，” Akins said. “Also，why pay 30 dollars for a new coat when you can get another one for a lot less？”　　 Akins said that the SA has shops all over the US - “some as big as department　stores.” All of the clothes are donated (捐赠)，and when they have a surplus (盈余)，they'll have “stuff a bag” specials，where customers can fill a grocery sack With clothes for only 5 or 10 dollars.　　Julia Slocum，22，points out，however，that the huge amount of second-hand clothing in the US is the result of American wastefulness.　　I'd say that second-hand stores are the result of our wasteful，materialistic culture，“ said Slocum，who works for a pro-conservation organization，the Center for a New American Dream. ”Thrift shops prevent that waste from going to landfills (垃圾填埋场)； they give clothing a second life，provide cheaper clothing for those who can't afford new ones and generate (生成)income for charities. They also provide a way for the wealthy and middle classes to shed (摆脱)some of the guilt for their level of consumption.“

单选题Young people often congregate in the main square in the evenings.

单选题One thing you need to know is that you don't obtain education only to {{U}}further{{/U}} your career. A. advance B. deserve C. renew D. retain

单选题Online Cancer Chat with a Safety Net Cancer Research U.K. has lanched an online chat forum for cancer patients to swap stories and share experiences on how to cope with such a devastating disease. But Cancer Chat is a forum with a difference: it has an information safety net. This means that a Cancer Research U.K. team will keep a watching brief to ensure that patients are not subjected to rogue "cancer cures" or scientifically unsound information. Anyone can have access to the messages posted on Cancer Chat but if people wish to post a message they will need to register. And Rebekah Gibbs, cancer patient and star of TV's Casualty has pledged her support for the new project. "I think Cancer Chat is a brilliant idea," she said. "I have written a public diary about what I went through with breast cancer and I have had such a heart-warming response from other people going through the same thing. "The idea of a Cancer Chat forum means you can share information about treatment and side effects and you can really open up about your feelings online in a way that can be difficult when talking to close friends and family. And with Cancer Research U.K. monitoring the forum people can be reassured about the quality of information being exchanged. " Cancer Chat will also encourage its users to check out any cancer questions on its CancerHelp U.K. website which is specially designed to give patients and their families 6,000 pages of up-to-date information that is easy to understand and explains a wide range of treatments for different types of cancer and gives details of clinical trials. There is also a U.K. database of cancer clinical trials. The award-winning website attracts around one million visitors a month and Cancer Research U.K. hopes that some of these visitors will also want to post comments on the Cancer. For those who do not have access to computers and have questions about cancer, the charity's team of cancer information nurses are available during office hours to talk over patients' concerns on the phone.

单选题He {{U}}stretched{{/U}} the net from one side of the river to the other so that it hung down into the water.