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Toward a Smarter Web
With the growth of the Web, many people have come to view the Internet as a handy source of information. Yet there are limits to the depth of the data that can be mined from cyberspacE.
Ask a search engine that runs on your favorite Web browser to tell you where you can buy a red convertible in Miami for under $35,000. Such a car does exist. But getting the answer on line is a daunting task that often entails multiple searches.
Now the Web's creator, British-born Tim Berners-Lee, has set about solving such problems. The goal is to provide for the automatic exchange of any type of content between many kinds of software programs, applications and databases and, when appropriate, between peoplE.
He compares the online situation today with the way things were when the first Web sites were launched almost exactly a decade ago. Before the Web created a Common programming language, accessing each database required users to learn a special set of internal rules, which could be quite arcanE.Consequently, only computer mavens bothered to get Internet addresses.
But after Berners-Lee developed the 'hypertext' system of linking documents and other information with the now-familiar Web tags, his creation became the fastest-growing data gathering system in human history, reaching 30 million active domain names in 2001.
Now, history is repeating itselF.Berners-Lee has dubbed his new project 'the semantic WeB.' While the coding concepts are complex, the idea behind them is simple enough. The semantic Web would allow programs to browse the Internet and trade data without any direct human intervention. In theory, that could turn all of cyberspace into a unified interactive computer.
'The semantic Web represents a long-term goal to change and improve the way in which computers and users work together, as well as the way computers work with other computers,' Berners-Lee told a Harvard graduate school seminar the other day. 'Instead of searching for words, we search for concepts that tie things together.'
Berners-Lee and his programming team seek to provide 'intelligent agents' the capacity to understand the underlying meaning -- the 'semantics' -- of the information they roam through to make their searches more meaningful and efficient.
The initial step is to create standards that allow users to add descriptive tags, or 'metadata,' to Web content, making it easier to pinpoint exactly what you're looking for. Next, methods will need to be found to enable different programs to relate to metadata from various Web sites. Finally, programmers will be able to craft applications that infer vital facts from the ones they've been given. And finding that convertible will be much easier.
A smarter Web is meant to be______.
A.a faster search enginE.
B.a semantic WeB.
C.a hypertext system.
D.a metadatA.

A.B.
C.
D.
E.
F.'
G.
H.'
I.
J.
A
K.
A.a
L.
B.a
M.
C.a
N.
D.a

【参考答案】

B
解析：根据提问，应该查找相关的段落。本题所问的问题也是与主旨有关。Berners-Lee has dubbe......

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The current malaise within Zimbabwe's tourism industry could benefit its long-term development by forcing it to examine its attitude towards fragile wilderness areas, argues Sally Wynn. My first experience of the Zambezi River's unique wilderness quality was a childhood walk upstream from Victoria Falls. Then, the revering bush really was wild and made a very strong first impression. Years later, a canoe trip from Manna Pools to Lake Cahora Bassa made me a wilderness convert for life and I feel truly lucky that my work sometimes takes me into remote parts of this magnificent river valley.I am not alonE.The Zambezi Society's membership consists almost entirely of people who value the wild nature of the Zambezi River so much that they want to do something to conserve it. And the trend is worldwidE.Type ' wilderness ' into an Internet search engine；the scores of societies and foundations devoted to wilderness appreciation, preservation and research show how popular this concept has become, as do the wilderness ' discovery ' experiences available to adventurous travelers.But still some people ask ' how relevant is wihlerness conservation in 21 st century Africa? ' Many argue that developing nations have more important concerns than setting aside wild places for the enjoyment of tourists and wilderness enthusiasts. But if the results of a recent Zambezi Society survey are anything to go by, wilderness conservation is very relevant indeeD.The argument that wilderness is an unaffordable luxury shows a singular lack of understanding not only of the vital link between tourism and development, but of the true value of Africa's wild areas to the continent's peoplE.At the height of its boom in the 1980s and early 90s, Zimbabwe's tourism industry was so busy counting the dollars that it paid scant heed either to the impact its success was having on major assets like the Zambezi River, or to whether its customers were satisfied with the experience they were getting for their money. The Zambezi Society and other conservation lobby groups were lone voices in the wilderness crying out for environmental sanity at places like Victoria Falls which, by 1995, was receiving bad press even in Time magazinE.By October 2000, the Society had defined ' Zambezi wilderness ' as visitors see it and identified the factors which detract from this wilderness. 98% of respondents felt it important that wild places exist, and it was evident that visitors to Victoria Falls were less satisfied with the quality of their wilderness experience than, for example, visitors to Mana Pools, due to overdevelopment, commercialisation and overcrowding. It seemed that hotels and tour operators were contributing to the erosion of wilderness values in sensitive areas by promoting high-impact activities, so we defined wilderness-sensitive and appropriate tourism facilities.What does the author think about the current situation of Zimbabwe's tourism industry?A.He is quite worried about its futurE.B.He is concerned about his own experience therE.C.He believes it is a good thing in the long run.D.He is not sure about whether it will step out of the current troubles.

A.What
B.He
C.
B.He
D.
C.He
E.
D.He

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Arsenic, a naturally occurring poison and carcinogen found in ground water, is strongly linked to adult-onset diabetes, U. S. researchers said on Tuesday. Odorless, tasteless, colorless and easily soluble in water or wine, arsenic has long been a feared poison. A heavy dose is detectable in a corpse, but researchers say small amounts of arsenic may sicken people gradually.Dr. Ana Navas-Aeien and colleagues at Johns Hopkins University in Baltimore found a ' relatively strong ' association between commonly found levels of arsenic in urine and type 2 diabetes in a study of American adults. ' It seems there is maybe no safe level of arseniC.' Navas-Acien said in a telephone interview. ' Worldwide it's a huge problem, ' she saiD.' As water becomes a scarce resourcE.the situation becomes even more serious. 'Arsenic raises the risk for cancers of the bladder, lung, kidney, skin and, possibly, the pros tate, Navas-Acien saiD.The 20 percent of nearly 800 study participants who had the most arsenic in their bodies, a tolerable 16. 5 micrograms per liter of urine, had 3. 6 times the risk of developing late-onset diabetes than those in the bottom 20 percent, who had 3 micrograms per liter. Levels of arsenic were 26 percent higher in people with late-onset, or type 2, diabetes than those without the disease, the study founD.The U. S. government sets a limit for drinking water at 10 micrograms of arsenic per liter, which is exceeded in the water consumed by 13 million Americans who mostly live in rural areas that rely on wells to bring up ground water, the researchers wrote in the Journal of the American Medical Association. Arsenic contaminates drinking water for millions of people in Bangladesh, parts of Central Europe, Chile, Argentina and the western United States, where ground water is the source of drinking water and the land has higher concentrations of arseniC.Overall, 7. 8 percent of Americans are believed to have diabetes, although some do not know it. At least 90 percent of cases are the type 2 variety, in which the body loses its ability to use insulin properly. Navas-Acien said arsenic may play a significant role in diabetes incidence, but it is difficult to say how much. Arsenic can accumulate in the body, and can ruin the body's ability to use insulin and perform. the vital task of converting blood sugar into energy. Normally, insulin fits into cells via molecular doorways called receptors, which in turn signal the cell to move glucose inside, but arsenic enters the cell and somehow blocks the activity. Seafood is another source of arsenic, but the organic form. found in shellfish and some fish has a carbon molecule attached and poses no risk to health, she saiD.According to the passage, arsenic contains______.A.smellB.tasteC.poisonD.color

A.According
B.
A.smell
B.taste
C.poison