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Internet采用哪种网络协议?该协议的主要层次结构?

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正确答案:

Tcp/Ip协议

主要层次结构为: 应用层/传输层/网络层/数据链路层/物理层。

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暂无解析

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How shops can exploit people's herd mentality to increase sales 1.A TRIP to the supermarket may not seem like an exercise in psychological warfare—but it is.Shopkeepers know that filling a store with the aroma of freshly baked bread makes people feel hungry and persuades them to buy more food than they had intended.Stocking the most expensive products at eye level makes them sell faster than cheaper but less visible competitors.Now researchers are investigating how “swarm intelligence” (that is,how ants,bees or any social animal,including humans,behave in a crowd) can be used to influence what people buy. 2.At a recent conference on the simulation of adaptive behaviour in Rome,Zeeshan-ul-hassan Usmani,a computer scientist from the Florida Institute of Technology,described a new way to increase impulse buying using this phenomenon.Supermarkets already encourage shoppers to buy things they did not realise they wanted: for instance,by placing everyday items such as milk and eggs at the back of the store,forcing shoppers to walk past other tempting goods to reach them.Mr Usmani and Ronaldo Menezes,also of the Florida Institute of Technology,set out to enhance this tendency to buy more by playing on the herd instinct.The idea is that,if a certain product is seen to be popular,shoppers are likely to choose it too.The challenge is to keep customers informed about what others are buying. 3.Enter smart-cart technology.In Mr Usmani's supermarket every product has a radio frequency identification tag,a sort of barcode that uses radio waves to transmit information,and every trolley has a scanner that reads this information and relays it to a central computer.As a customer walks past a shelf of goods,a screen on the shelf tells him how many people currently in the shop have chosen that particular product.If the number is high,he is more likely to select it too. 4.Mr Usmani's “swarm-moves” model appeals to supermarkets because it increases sales without the need to give people discounts.And it gives shoppers the satisfaction of knowing that they bought the “right” product—that is,the one everyone else bought.The model has not yet been tested widely in the real world,mainly because radio frequency identification technology is new and has only been installed experimentally in some supermarkets.But Mr Usmani says that both Wal-Mart in America and Tesco in Britain are interested in his work,and testing will get under way in the spring. 5.Another recent study on the power of social influence indicates that sales could,indeed,be boosted in this way.Matthew Salganik of Columbia University in New York and his colleagues have described creating an artificial music market in which some 14,000 people downloaded previously unknown songs.The researchers found that when people could see the songs ranked by how many times they had been downloaded,they followed the crowd.When the songs were not ordered by rank,but the number of times they had been downloaded was displayed,the effect of social influence was still there but was less pronounced.People thus follow the herd when it is easy for them to do so. 6.In Japan a chain of convenience shops called RanKing RanQueen has been ordering its products according to sales data from department stores and research companies.The shops sell only the most popular items in each product category,and the rankings are updated weekly.Icosystem,a company in Cambridge,Massachusetts,also aims to exploit knowledge of social networking to improve sales. 7.And the psychology that works in physical stores is just as potent on the internet.Online retailers such as Amazon are adept at telling shoppers which products are popular with like-minded consumers.Even in the privacy of your home,you can still be part of the swarm. Questions 1-6 Complete the sentences below with words taken from the reading passage.Use NO MORE THAN THREE WORDS for each answer. 1.Shopowners realize that the smell of _______________ can increase sales of food products. 2.In shops,products shelved at a more visible level sell better even if they are more _______________. 3.According to Mr.Usmani,with the use of “swarm intelligence” phenomenon,a new method can be applied to encourage _______________. 4.On the way to everyday items at the back of the store,shoppers might be tempted to buy _______________. 5.If the number of buyers shown on the _______________ is high,other customers tend to follow them. 6.Using the “swarm-moves” model,shopowners do not have to give customers _______________ to increase sales.
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Felicity Lawrence Thursday December 28, 2006 The Guardian 1. Consumers are to be presented with two rival new year advertising campaigns as the Food Standards Agency goes public in its battle with the industry over the labelling of unhealthy foods. 2. The Guardian has learned that the FSA will launch a series of 10-second television adverts in January telling shoppers how to follow a red, amber and green traffic light labelling system on the front of food packs, which is designed to tackle Britain’s obesity epidemic. 3. The campaign is a direct response to a concerted attempt by leading food manufacturers and retailers, including Kellogg’s and Tesco, to derail the system. The industry fears that traffic lights would demonise entire categories of foods and could seriously damage the market for those that are fatty, salty or high in sugar. 4. The UK market for breakfast cereals is worth £1.27bn a year and the manufacturers fear it will be severely dented if red light labels are put on packaging drawing attention to the fact that the majority are high in salt and/or sugar. 5. The industry is planning a major marketing campaign for a competing labelling system which avoids colour-coding in favour of information about the percentage of "guideline daily amounts" (GDAs) of fat, salt and sugar contained in their products. 6. The battle for the nation’s diet comes as new rules on television advertising come into force in January which will bar adverts for unhealthy foods from commercial breaks during programmes aimed at children. Sources at the TV regulators are braced for a legal challenge from the industry and have described the lobbying efforts to block any new ad ban or colour-coded labelling as "the most ferocious we’ve ever experienced". 7. Ofcom’s chief executive, Ed Richards, said: "We are prepared to face up to any legal action from the industry, but we very much hope it will not be necessary." The FSA said it was expecting an onslaught from the industry in January. Senior FSA officials said the manufacturers’ efforts to undermine its proposals on labelling could threaten the agency’s credibility. 8. Terrence Collis, FSA director of communications, dismissed claims that the proposals were not based on science. "We have some of the most respected scientists in Europe, both within the FSA and in our independent advisory committees. It is unjustified and nonsensical to attack the FSA’s scientific reputation and to try to undermine its credibility." 9. The FSA is understood to have briefed its ad agency, United, before Christmas, and will aim to air ads that are "non-confrontational, humorous and factual" as a counterweight to industry’s efforts about the same time. The agency, however, will have a tiny fraction of the budget available to the industry. 10. Gavin Neath, chairman of Unilever UK and president of the Food and Drink Federation, has said that the industry has made enormous progress but could not accept red "stop" signs on its food. 11. Alastair Sykes, chief executive of Nestlé UK, said that under the FSA proposals all his company’s confectionery and most of its cereals would score a red. "Are we saying people shouldn’t eat confectionery? We’re driven by consumers and what they want, and much of what we do has been to make our products healthier," he said. 12. Chris Wermann, director of communications at Kellogg’s, said: "In principle we could never accept traffic light labelling." 13. The rival labelling scheme introduced by Kellogg’s, Danone, Unilever, Nestlé, Kraft and Tesco and now favoured by 21 manufacturers, uses an industry-devised system based on identifying GDAs of key nutrients. Tesco says it has tested both traffic lights and GDA labels in its stores and that the latter increased sales of healthier foods. 14. But the FSA said it could not live with this GDA system alone because it was "not scientific" or easy for shoppers to understand at a glance. Questions 1-6 Answer the questions below using NO MORE THAN THREE WORDS from the passage for each answer. 1. When will instructions be given on reading the color-coded labels? 2. Where can customers find the red light labels? 3. What problem is the FSA trying to handle with the labeling system? 4. Which product sells well but may not be healthy? 5. What information, according to the manufacturers, can be labeled on products? 6. What can not be advertised during children’s programmes? Questions 7-13 Use the information in the text to match the people (listed A-E) with the opinions (listed 7-13) below. Write the appropriate letter (A-E) for questions 1-7. NB You may use any letter more than once. A Ed Richard B Terrence Collis C Gavin Neath D Alastair Sykes E Chris Wermann 7. Generally we will not agree to use the red light labels. 8. It is unreasonable to doubt if FSA is trustworthy. 9. We are trying to meet our consumers’ needs. 10. The food industry has been improving greatly. 11. The color-coded labeling system is scientific. 12. Our products will be labeled unhealthy by the FSA. 13. We are ready to confront the manufacturers.
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new weapon to fight cancer 1. British scientists are preparing to launch trials of a radical new way to fight cancer, which kills tumours by infecting them with viruses like the common cold. 2. If successful, virus therapy could eventually form a third pillar alongside radiotherapy and chemotherapy in the standard arsenal against cancer, while avoiding some of the debilitating side-effects. 3. Leonard Seymour, a professor of gene therapy at Oxford University, who has been working on the virus therapy with colleagues in London and the US, will lead the trials later this year. Cancer Research UK said yesterday that it was excited by the potential of Prof Seymour’s pioneering techniques. 4. One of the country’s leading geneticists, Prof Seymour has been working with viruses that kill cancer cells directly, while avoiding harm to healthy tissue. "In principle, you’ve got something which could be many times more effective than regular chemotherapy," he said. 5. Cancer-killing viruses exploit the fact that cancer cells suppress the body’s local immune system. "If a cancer doesn’t do that, the immune system wipes it out. If you can get a virus into a tumour, viruses find them a very good place to be because there’s no immune system to stop them replicating. You can regard it as the cancer’s Achilles’ heel." 6. Only a small amount of the virus needs to get to the cancer. "They replicate, you get a million copies in each cell and the cell bursts and they infect the tumour cells adjacent and repeat the process," said Prof Seymour. 7. Preliminary research on mice shows that the viruses work well on tumours resistant to standard cancer drugs. "It’s an interesting possibility that they may have an advantage in killing drug-resistant tumours, which could be quite different to anything we’ve had before." 8. Researchers have known for some time that viruses can kill tumour cells and some aspects of the work have already been published in scientific journals. American scientists have previously injected viruses directly into tumours but this technique will not work if the cancer is inaccessible or has spread throughout the body. 9. Prof Seymour’s innovative solution is to mask the virus from the body’s immune system, effectively allowing the viruses to do what chemotherapy drugs do - spread through the blood and reach tumours wherever they are. The big hurdle has always been to find a way to deliver viruses to tumours via the bloodstream without the body’s immune system destroying them on the way. 10. "What we’ve done is make chemical modifications to the virus to put a polymer coat around it - it’s a stealth virus when you inject it," he said. 11. After the stealth virus infects the tumour, it replicates, but the copies do not have the chemical modifications. If they escape from the tumour, the copies will be quickly recognised and mopped up by the body’s immune system. 12. The therapy would be especially useful for secondary cancers, called metastases, which sometimes spread around the body after the first tumour appears. "There’s an awful statistic of patients in the west ... with malignant cancers; 75% of them go on to die from metastases," said Prof Seymour. 13. Two viruses are likely to be examined in the first clinical trials: adenovirus, which normally causes a cold-like illness, and vaccinia, which causes cowpox and is also used in the vaccine against smallpox. For safety reasons, both will be disabled to make them less pathogenic in the trial, but Prof Seymour said he eventually hopes to use natural viruses. 14. The first trials will use uncoated adenovirus and vaccinia and will be delivered locally to liver tumours, in order to establish whether the treatment is safe in humans and what dose of virus will be needed. Several more years of trials will be needed, eventually also on the polymer-coated viruses, before the therapy can be considered for use in the NHS. Though the approach will be examined at first for cancers that do not respond to conventional treatments, Prof Seymour hopes that one day it might be applied to all cancers. Questions 1-6 Do the following statements agree with the information given in the reading passage? For questions 1-6 write TRUE if the statement agrees with the information FALSE if the statement contradicts the information NOT GIVEN if there is no information on this in the passage 1.Virus therapy, if successful, has an advantage in eliminating side-effects. 2.Cancer Research UK is quite hopeful about Professor Seymour’s work on the virus therapy. 3.Virus can kill cancer cells and stop them from growing again. 4.Cancer’s Achilles’ heel refers to the fact that virus may stay safely in a tumor and replicate. 5.To infect the cancer cells, a good deal of viruses should be injected into the tumor. 6.Researches on animals indicate that virus could be used as a new way to treat drug-resistant tumors. Question 7-9 Based on the reading passage, choose the appropriate letter from A-D for each answer. 7.Information about researches on viruses killing tumor cells can be found (A) on TV (B) in magazines (C) on internet (D) in newspapers 8.To treat tumors spreading out in body, researchers try to (A) change the body’ immune system (B) inject chemotherapy drugs into bloodstream. (C) increase the amount of injection (D) disguise the viruses on the way to tumors. 9.When the chemical modified virus in tumor replicates, the copies (A) will soon escape from the tumor and spread out. (B) will be wiped out by the body’s immune system. (C) will be immediately recognized by the researchers. (D) will eventually stop the tumor from spreading out. Questions 10-13 Complete the sentences below. Choose your answers from the list of words. You can only use each word once. NB There are more words in the list than spaces so you will not use them all. In the first clinical trials, scientists will try to ……10…… adenovirus and vaccinia, so both the viruses will be less pathogenic than the ……11…….These uncoated viruses will be applied directly to certain areas to confirm safety on human beings and the right ……12…… needed. The experiments will firstly be ……13……to the treatment of certain cancers
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