单选题In the first year or so of Web business, most of the action has revolved around efforts to tap the consumer market. More recently, as the Web proved to be more than a fashion, companies have started to buy and sell products and services with one another. Such business to business sales make sense because business people typically know what product they're looking for. Nonetheless, many companies still hesitate to use the Web because of doubts about its reliability. "Businesses need to feel they can trust the pathway between them and the supplier," says senior analyst Blane Erwin of Forrester Research. Some companies are limiting the risk by conducting online transactions only with established business partners who are given access to the company's private intranet. Another major shift in the model for Internet commerce concerns the technology available for marketing. Until recently, Internet marketing activities have focused on strategies to "pull" customers into sites. In the past year, however, software companies have developed tools that allow companies to "push" information directly out to consumers, transmitting marketing messages directly to targeted customers. Most notably, the PointCast Network uses a screen saver to deliver a continually updated stream of news and advertisements to subscribers' computer monitors. Subscribers can customize the information they want to receive and proceed directly to a company's Web site. Companies such as Virtual Vineyards are already starting to use similar technologies to push messages to customers about special sales, product offerings, or other events. But push technology has earned the contempt of many Web users. Online culture thinks highly of the notion that the information flowing onto the screen comes there by specific request. Once commercial promotion begins to fill the screen uninvited, the distinction between the Web and television fades. That's a prospect that horrifies Net purists. But it is hardly inevitable that companies on the Web will need to resort to push strategies to make money. The examples of Virtual Vineyards, Amazon. com, and other pioneers show that a Web site selling the right kind of products with the right mix of interactivity, hospitality, and security will attract online customers. And the cost of computing power continues to free fall, which is a good sign for any enterprise setting up shop in silicon. People looking back 5 or 10 years from now may well wonder why so few companies took the online plunge.

单选题I was told that the woman was indifferent ______ hardships and dangers.

单选题 The patient complained that his doctor had been negligent in not giving him a full examination.

单选题Captain Sentry retired to the country because he was ______.

单选题Ball-players, runners, boxers, swimmers, etc are______.

单选题By the end of the Middle Ages the technological systems called cities had long since become a central feature of Western life. In 1600 London and Amsterdam each had populations of more than, 100,000, and twice that number 1 in Paris. Also, the Dutch, English, Spanish, and French were beginning to 2 global empires. 3 and trade produced a 4 merchant class that helped to 5 an increasing desire for such 6 as wine, coffee, tea, cocoa, and tobacco. These merchants set a 7 of life aspired to by the wider populace. 8 the beginning of the 18th century, capital resources and banking systems were well enough established in Great Britain to 9 investment in mass-production 10 that would satisfy some of these middle-class aspirations. The Industrial Revolution 11 in England, because that nation had the technological means, government encouragement, and a large and varied trade 12 . The first factories 13 . in 1740, concentrating on 14 . production. In 1740 the majority of English people wore woolen garments, bu 15 . the next 100 years the rough, often waterlogged and unhealthy woolens were 16 . by cotton—especially after the 17 . of the cotton gin (轧棉机) by Eli Whitney, an American, in 1793. One of the most important innovations in the weaving process was 18 . in France in 1801 by Joseph Jacquard; his loom used cards with holes punched in them to determine the placement of threads in the warp (弯夹撬棍). This use of punched cards inspired the British mathematician Charles Babbage to attempt to 19 . a calculating machine based on the same principle. Although this machine never became fully practical, it 20 . the great computer revolution of the 20th century.

单选题There is only one difference between an old man and a young one: the young one has a glorious future before him and the old one has a______future behind him.

单选题On______ to power the new President announced a program of social reforms.

单选题Don't trust the speaker any more, since his deeds are never compatible with his ideology.

单选题Although diverse, African music has certain distinctive traits , one of which is the use of repetition as an organizing principle.

单选题Can you______the truth of his statement?

单选题With the start of BBC World Service Television, millions of viewers in Asia and America can now watch the Corporation"s news coverage, as well as listen to it. And of course in Britain listeners and viewers can tune in to two BBC television channels, five BBC national radio services and dozens of local radio station. They are brought sport, comedy, drama, music, news and current affairs, education, religion, parliamentary coverage, children"s pragrammes and films for an annual licence fee of 83 pounds per household. It is a remarkable record, stretching back over 70 years—yet the BBC"s future is now in doubt. The Corporation will survive as a publicly-funded broadcasting organization, at least for the time being, but its role, its size and its programmes are now the subject of a nation-wide debate in Britain. The debate was launched by the Government, which invited anyone with an opinion of the BBC—including ordinary listeners and viewers—to say what was good or bad about the Corporation, and even whether they thought it was worth keeping. The reason for its inquiry is that the BBC"s royal charter runs out in 1996 and it must decide whether to keep the organization as it is, or to make changes. Defenders of the Corporation—of whom there are many—are fond of quoting the American slogan "If it ain"t broke, don"t fix it." The BBC "ain"t broke", they say, by which they mean it is not broken (as distinct from the word "broke", meaning having no money), so why bother to change it? Yet the BBC will have to change, because the broadcasting world around it is changing. The commercial TV channels—TV and Channel 4—were required by the Thatcher Government"s "Broadcasting Act" to become more commercial, competing with each other for advertisers, and cutting costs and jobs. But it is the arrival of new satellite channels—funded partly by advertising and partly by viewers" subscriptions-which will bring about the biggest changes in the long term.

单选题It's desirable that you have to speak to both groups of men quickly if you want to ______a nasty disagreement.

单选题Which of the following can be the best title for the passage?

单选题Under a new law, universities must ______ smoke-free policies on their campuses.

单选题After years of research, Charles Drew devised a procedure for preserving plasma. A. transporting B. saving C. reusing D. labeling

单选题As spring unfolds across North America, tornadoes once again are in the news. It's a reminder that the United States is the severe-storm capital of the world. Describing this status recently in the Bulletin of the American Meteorological Society, Elbert W. Friday Jr., National Weather Service director, observed that "the United States experiences more severe local storms and flooding than any other country in the world. " He added that a typical year brings "some 10000 violent thunderstorms, 5000 floods, and 1000 tornadoes. " Yet the country is not helpless before this onslaught, thanks to advances in meteorological knowledge and in the forecast and warning system, the tornado death rate, for example, has been cut in half in recent decades. It's down from nearly 2000 per decade 60 years ago to less than 1000 per decade today. Now the weather service is poised for what Mr. Friday calls "a meteorological revolution. " Sharp-eyed new radars, more vigilant weather satellites, and computerized-information handling will bring what he calls "dramatic improvements in... forecasts and.., detection of and warnings for severe weather. " This is particularly true for tornadoes. These funnel-shaped circulations develop in association with severe thunderstorms. As the National Center for Atmospheric Research (NCAR) in Boulder, Colo., explains, the funnels often form at the thundercloud base. But tornado spotters also have to watch what's happening on the ground. The first clue may be swirling dust and debris. Of the 710 to 1000 tornadoes reported annually in the US, about 79 percent are what the American Meteorological Society calls " weak ". About 20 percent are "strong" About 1 percent are "violent". Weak funnels last under 10 minutes and have wind speeds on the order of 110 miles per hour. They leave ground tracks less than a mile long and 100 yards wide. Although called "week", they are potentially dangerous, while their short lifetimes make timely warnings difficult. Strong tornadoes last from 10 minutes to more than two hours. Maximum winds, as estimated from damage surveys, range up to 280 mph or higher. A single thunderstorm cell may produce these powerful tornadoes in cycles. Each such sequence may last for tens of minutes. It can leave damage trails over 100 miles long by 1000 yards wide. Tornadoes have touched towns throughout North America in every month of the year. But NCAR notes that they occur predominantly over the Great Plains and Midwest and are common in Easter states and the Gulf of Mexico. Their region of most frequent occurrence begins near the Gulf Coast in March and shifts toward Kansas, Iowa, and Nebraska by May and June. A weather satellite Launched April 13 will help forecasters monitor this tornado "season". The $220 million GOES-8 (Geostationary Operational Environmental Satellite), the first of five improved weather "eye", can pinpoint storms to within 1.2 miles, compared with 6.2 to 12.4 miles for the old system. A new class of radars is also part of the meteorological "revolution". Unlike their predecessors, they sense motion of clouds, rain, and wind-borne debris. There will be 150 such radar sites. The National Weather Service will have 121. The Federal Aviation Agency and the Department of Defense will operate the other installations and share data with the Weather Service.

单选题The fitness movement that began in the late 1960s and early 1970s centered around aerobic exercise. Millions of individuals became (1) in a variety of aerobic activities, and (2) thousands of health spas (3) around the country to capitalize on this (4) interest in fitness, particularly aerobic dancing for females. A number of fitness spas existed (5) to this aerobic fitness movement, even a national chain with spas in most major cities. However, their (6) was not on aerobics, (7) on weight-training programs de signed to develop muscular mass, (8) , and endurance in their primarily male (9) These fitness spas did not seem to benefit (10) from the aerobic fitness movement to bet ter health, since medical opinion suggested that weight-training programs (11) few, if (12) , health benefits. In recent years, however, weight training has again become in creasingly (13) for males and for females. Many (14) programs focus not only on devel oping muscular strength and endurance but on aerobic fitness as well. (15) , most physi cal-fitness tests have usually included measures of muscular strength and endurance, not for health-related reasons, but primarily (16) such fitness components have been related to (17) in athletics. (18) , in recent years, evidence has shown that training programs designed primarily to improve muscular strength and endurance might also offer some health (19) as well. The American College of Sports Medicine now (20) that weight training be part of a total fitness program for healthy Americans.