单选题{{B}}第二篇{{/B}} {{B}} Supermarket{{/B}} Most supermarkets need a very large floor area, sometimes at least ten times as big as that of an ordinary shop. There are usually two doors, one as an entrance and the other as an exit. The rest of the side facing the street is largely of plate glass, with goods or advertising material displayed. The other three walls are normally decorated in light colours, giving an impression of cleanliness (清洁)and brightness. Most supermarkets are on one floor only. Goods being stored in rooms at the back or upstairs. At right-angles to the window stretch long structures about six feet high with a number of shelves on each side. Similar shelf units or frozen food containers extend round the walls. Broad aisles(通道)between the shelf units and ample(足够的)space between them and the window and also the far wall allow room for the circulation of many people. Individual commodities(商品), in tins, bags, boxes or other containers, are stacked (堆放) in groups on the shelves, and each group is labelled with a price ticket. Metal baskets near the entrance are taken by the shoppers who collect in them the goods they select from the shelves. Between the shelf units and the window in one half of the shops are a number of small counters about three feet high. Beside each sits a cashier (现金出纳员), who operates a machine for reckoning, detailing the cost of each customer's purchases. The customer places the basket at one end of the counter so that it can be emptied by the cashier who records the price of the commodities one by one, before putting each on a moving section of the counter top. The goods are collected and packed into the customer's bag by another assistant at the end of the counter. The cashier finally hands a printed slip recording all prices to the customer, who pays the total, collects the bag and leaves.

单选题How many diagnosed diabetes patients are there in Britain?

单选题Hypnosis is not effective in treating cigarette smokers and persons who eat or drink too much is because______

单选题They have given up the hope to save their friend from drowning.

单选题Fine freshwater pearls are found in the main stream and the {{U}}tributaries{{/U}} of the Mississippi River. A. banks B. deltas C. branches D. currents

单选题Digital Frog The animal dissection requirement of biology classes has been getting under the skin of students for generations, and there have always been some who asked to be excused from the requirement. Now, a growing number of technological alternatives are making it possible for students to swap that scalpel for a computer mouse. There are laws in nearly a dozen states—including California, Florida, New Jersey, and New York—protecting a student"s choice to learn about animal anatomy sans scalpel. Some students choosing to opt out feel we should be kinder to our web-footed friends. Others are just queasy at the thought of rubbery frog bodies and the smell of formaldehyde. "Dissection is icky. There"s a yuck factor," admits Brian Shmaefsky, a board member with the National Association of Biology Teachers. "And a teacher has to weigh the benefits with the cost of students being offended to the point that it interferes with learning." Virtual blades. So for cases in which a real dissection would be too slimy, it"s time to try some toad tech. While the first computer-based alternatives to dissection emerged in the 1980s, modern frog dissection software can be found at different websites. These software programs use creative clicking, high-powered zoom functions, and video clips to teach anatomy. Froguts software, for example, let students trace incision lines with a computer mouse and snip through skin with a virtual blade. There are even sound effects like a "slish" for slicing frog flesh, or a "shwoosh" for pinning down skin flaps. (Schools currently pay about $300 for a one-year software license, though some organizations will lend programs out free of charge.) Earlier this year, a graduate student from Simon Fraser University in Vancouver designed the first-ever haptic (the Greek word for "touch") frog dissection program, which uses a penlike tool to create a sensation similar to cutting into real flesh. The hand-held device connects to a computer, and students move the device through the air while watching the results of their actions on a computer screen. With Digital Frog—a popular program that"s had approximately 1,500 frog demo downloads since January and is currently in use in 2,000 schools—students can add or subtract those amphibious organs with a mere mouse click. They can then assess their learning with sporadic frog anatomy quizzes. "Repetition is helpful. The fact that a student can review sections of a program over and over again is important," says Martin Stephens, vice president for animal research issues at the Humane Society of the United States. "In dissections, the animal"s organs are all shriveled and discolored. You look for things and can"t find them because body parts have changed drastically since the animal was killed. But on a computer screen, layers can be digitally peeled away." Other experts think the dissection technology has its limits. Gerry Wheeler, executive director of the National Science Teachers Association, says that artificial simulations don"t give as enriching an experience as the real thing. Still others worry the programs are depriving kids of experiential learning.

单选题Poor health and lack of money may both be to educational progress roadblocks.

单选题The newly bought car brings nothing but trouble.A. nearlyB. quicklyC. generallyD. only

单选题Listening to Birdsong A male zebra finch (雀科鸣鸟) chirps (鸣) away to himself. Suddenly he notices a female bird nearby. He realizes he has an audience and immediately changes his song. Can the female tell the difference in his performance? According to a new study, the female zebra finch knows. And she prefers the special trills he creates when he sings to her. A male zebra finch changes his song when singing to a female in ways that people can barely detect. But the female finch can tell the difference. Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female (and potential mate) nearby. With an audience, the males sped up the pace of their songs and controlled the notes they used. For this study, researchers Sarah C. Woolley and Allison Doupe, at the University of California, San Francisco, decided to focus attention on the listening females, which have not been well studied in the past. In the study, Woolley and Doupe set up a long cage with a sound speaker at each end. One broadcast the sound of a male zebra finch singing to himself, like someone singing in the shower. The other speaker broadcast a male performing for a female audience, as if he was giving a concert. Female birds were placed between the two speakers. Some of the birds had mates, others didn"t. The females shifted around a bit, and then most of them hopped over to sit beside just one speaker. All the birds that made a clear choice liked songs meant for a female audience, even if they"d never met the male. Mated females also had a chance to listen to two different performance songs, one from an unknown male, and one from their mate. They spent more time listening to the concert version of their mates" songs, this suggests that after a while, females learn to recognize and prefer the songs of their mates. Scientists then studied the brains of the females. They found certain areas of the brain perked up (活跃起来) when the birds listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them. This research deals with what"s called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way morns speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter (喋喋不休), and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.

单选题According to news reports, US restaurants are partly to blame for the growing bellies. Awaiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They prefer to have customers complain about too much food rather than too little. Barbara Roils, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand. The average waistline of Americans started to growA. two or three years ago.B. in the 1970s.C. about four years ago.D. since last year.

单选题Stem Cell Therapy May Help Repair the Heart According to scientists in the USA, stem cell therapy may one day be able to repair the hearts of people with heart failure. Researchers at Pittsburgh University School of Medicine examined 20 patients who had severe heart failure and were going to have surgery. They injected stem cells into the parts of their hearts that were damaged. They then compared their hearts with those of people who had undergone surgery without having the stem cells injected into them (they had also suffered from severe heart failure). The patients who had the stem cells injected had hearts that were able to pump (用泵抽水) more blood than the others. According to Robert Kormos, one of the researchers, these results could revolutionize heart treatment. Although previous studies had indicated that there might be a benefit, this is the first study that has actually proved that stem cell therapy can help the failing heart work better. All the patients in this study had hearts that could not pump blood properly. The scientists measured their ejection fraction (射血分数). This is a measure of heart performance; you measure how much blood is being pumped out by the left ventricle (心室). Healthy people"s ejection fraction is about 55%. These patients had ejection fraction of under 35%. They all had by-pass surgery (搭桥手术) performed on them. Some of the patients had stem cells taken from their hip bones and injected into 25-30 sites in the damaged heart muscle. Six months later their ejection fraction rate was 46.1% while those who just had surgery but no stem cell injections averaged 37.2%. No side effects were reported. Heart failure is a common problem all over the world. In the UK alone about 650,000 people suffer from heart failure every year. As the number of people suffering from heart failure increases in the world in general these findings are particularly significant. Current treatments relieve the symptoms. This new stem cell therapy actually repairs the damaged muscle in the heart and has the potential of curing the disease.

单选题Such a database would be extremely costly to set up .

单选题A Long and Expensive War By the Treaty of Paris of 1763, which ended the war with the French and the Indians, England gained possession of Canada and all the territory east of the Mississippi River. French influence on this continent thus came to an end; England now controlled most of North America. But the war had been long and expensive. England had many debts. George III , King of England, after consulting with his advisers, decided that the American colonists (殖民者) should help pay some of the expenses of this war. A standing English army of 10,000 men had been left in the colonies(殖民地) for protection against the Indians. The English government also felt that the colonists should share in the expenses of maintaining this army. The result was a series of measure, the Grenville Program, passed by Parliament and designed to raise money in the colonies. Some of these measures were accepted by The colonists, but one in particular, the Stamp Act, was met with great protest. The Stamp Act required that stamps, ranging in price from a few cents to almost a dollar, be placed on all newspapers, advertisements, bills of sale, wills, legal papers, etc. the Stamp Act was one of the causes of the American Revolution. It affected everyone, rich and poor alike. Some businessmen felt that the act would surely ruin their businesses. Of all the voices raised in protest to the Stamp Act, none had greater effect than that of a young layer from Virginia-Patrick Henry. Henry had only recently been elected to the Virginia Assembly. Yet when the Stamp Act came up for discussion, he opposed it almost single-handedly. He also expressed, for the first time, certain ideas that were held by many Americans of the time but that never before had been stated so openly. "Is life so dear or peace so sweet, as to be bought at the price of chains and slavery? Forbid it, Almighty(万能的) God! I know not what course others may take, but as for me, give me liberty, or give me death!/

单选题The Body Clock Why is it that flying to New York from London will leave you feeling less tired than flying to London from New York? The answer may be a clear case of biology not being able to keep up with technology. Deep inside the brain there is a "clock" that governs every aspect of the body's functioning: sleep and wake cycles, levels of alertness, performance, mood, hormone levels, digestion, body temperature and so on. It regulates all of these functions on a 24-hour basis and is called the biological clock. The body clock programs us to be sleepy twice a day, between 3-5 am and again between 3-5 pm. Afternoon tea and nap are all cultural responses to our natural biological sleepiness in the afternoon. One of the major causes of the travelers' malady known as jet lag is the non-alignment of a person's internal body clock with clocks in the external world. Crossing different time zones confuses the biological clock, which then has to adjust to the new time and patterns of light and activity. To make matters more complex, not all internal body functions adjust at the same rate. So your sleep/wake may adjust to a new time zone at one rate, while your temperature adjusts at a different pace. Your digestion may be on a different schedule altogether. Though we live in a 24-hour day, the natural tendency of the body clock is to extend our day beyond 24 hours. It is contrary to our biological programming to "shrink" our day. That is why traveling in a westward direction is more body-clock friendly than flying east. NASA studies of long haul pilots showed that westward travel was associated with significantly better sleep quantity and quality than eastward flights. When flying west, you are extending your day, thus traveling in the natural direction of your internal clock. Flying eastward will involve "shrinking" or reducing your day and is in direct opposition to your internal clock's natural tendency. One of the more common complaints of travelers is that their sleep becomes disrupted. There are many reasons for this: changing time zones and schedules, changing light and activity levels, trying to sleep when your body clock is programmed to be awake, disruption of the internal biological clock and working longer hours. It is often suggested that you adjust your watch as soon as you board a plane, supposedly to try to help you adjust to your destination's schedule as soon as you arrive. But it can take the body clock several days to several weeks to fully adjust to a new time zone. So, our body clock truly can "govern" us.

单选题 Obesity: the Scourge of the Western World Obesity is rapidly becoming a new scourge of the western world, delegates agreed at the 11th European Conference on the issue in Vienna Wednesday to Saturday. According to statements before the opening of the conference—of 2,000 specialists from more than 50 countries—1.2 billion people worldwide are overweight, and 250 million are obese. Professor Bernhard Ludvik of Vienna General Hospital said: "Obesity is a chronic illness. In Germany, 20 percent of the people are already affected, but in Japan only one percent." But he said that there was hope for sufferers thanks to the new scientific discoveries and medication. Professor Friedrich Hopichler of Salzberg said. "We are living in the new age (but) with the metabolism of a stone-age man." "I have just been to the United States. It is really terrible. A pizza shop is springing up on every corner. We have been overrun by fast food and Coca-Cola-ization." Many of the experts stressed that obesity was a potential killer. Hopichler said: "80 percent of all diabetics are obese, also 50 percent of all patients with high blood pressure and 50 percent with adipose tissue complaints." "10 percent more weight means 13 percent more risk of heart disease. Reducing one's weight by 10 percent leads to 13 percent lower blood pressure." Another expert Hermann Toplak said that the state health services should improve their financing of preventive programs. "Though the health insurance pays for surgery (such as reducing the size of the stomach) when the body-mass index is more than 40. That is equivalent to a weight of 116 kilograms for a height of 1.70 meters. One should start earlier." Ludvik said that prevention should begin in school. "Child obesity (fat deposits) correlates with the time which children spend in front of TV sets." The consequences were only apparent later on. No more than 15 percent of obese people lived to the average life expectancy for their population group.

单选题These are defensive behavior patterns which {{U}}derive{{/U}} from our fears. A. stem B. rely C. develop D. grow

单选题Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch. "It took us a long time to figure out what a window really is," says Claes Granqvist. He"s a professor of solid-state physics at Uppsala University in Sweden. "It"s contact with the outside world. You have to have visual contact with the surrounding world to feel well." So, windows and natural light are important for improving the way people feel when they"re stuck indoors. Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When it"s hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it"s completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. One important feature that makes a smart window so smart is that it has a sort of "memory". All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different."

单选题Is Your Child"s Stomach Pain All in His Head? We all know there are times that kids seem to complain 1 a stomachache to get out of chores or going to school. Don"t be so sure that the pain they 2 is all in their minds. We"re learning more now about a condition 3 "functional abdominal pain" that is experienced by millions of kids every day. Like many teenagers, Kyle Brust makes it a point to do his homework as 4 as he gets home. Unlike most, Kyle often did this with a terrible stomachache. In fact, the 5 often started while he was at school, but getting help there was getting harder. "Some of my teachers wouldn"t let me go, because I"d asked so many times before and they thought I was trying to get out of 6 ," says Kyle. Kyle"s mom Marilyn says she couldn"t blame the 7 . After all, she"d taken him to the doctor several times herself, and even they couldn"t find anything 8 . "You know, you"re running the tests and nothing"s coming up. So, is it in his head, is he just an extremely stressful child? It"s just frustrating 9 we"re not finding any answers, says Marilyn. It turns out Kyle was suffering from a condition known 10 functional abdominal pain, that affects as many as one out of every ten kids in this country. Even 11 the cause of the pain may not be obvious, there are real consequences. "It really does hurt, and these kids really do suffer," says Dr. Campo, MD at Nationwide Children"s Hospital. To help 12 , Campo is looking into a new approach. He"s conducting clinical trials of an antidepressant that changes the way the body handles a chemical called serotonin. In a preliminary study, Dr. Campo found that in about eight out of ten 13 , the drug normally used to treat emotional pain worked to ease the pain in the 14 . "We think about it as being important in anxiety and depression and that"s all quite true, but what"s really interesting is that 95% of our body"s serotonin is in our gut," says Campo. Campo believes these kids have extremely sensitive intestines, and controlling the effects of serotonin may 15 ease the pain. It seemed to work for Kyle, who is now completely pain free for the first time in years.

单选题______ a book in his hand, he went in from the back door.A. To catchB. CatchingC. CaughtD. To be caught

单选题Please let me know if you are unable to attend the meeting. A. go to B. prepare for C. speak to D. do to