单选题In the text, the vaccine research against HPV shows that

单选题Ricke attracts great attention because

单选题By mentioning the tree throwing out new branches, the author hopes to______

单选题The implementation of road pricing in London is primarily intended to

单选题{{B}}Text 4{{/B}} What is less well understood by the general public is that- there have been a number of trends which have further contributed to the diminishment of excavation as an activity. As Bahn puts it "there have been two major trends over time: first, excavation has become far slower and more painstaking .... The work is incredibly meticulous... Secondly, we can learn far more from what we have." The conclusions to be drawn from this would appear to be contradictory. As technology improves we are able to undertake a wide variety of analysis from microscopic, radio carbon dating or even DNA 'samples. The ability to determine more, from fewer samples again suggests that less excavation is required. Moreover, more often than not the balance of effort now rests with the specialist analysis such as pollen experts and dating analysis rather than the excavators. So, again some of the requirements for extensive excavation have diminished through the advancement of other analytical techniques and not just surface survey techniques. Furthermore, Archaeology itself has changed in a number of ways. No longer is the emphasis simply upon the acquisition of material culture or artefacts. In many cases, we have a reasonable understanding of the surviving material culture, Indeed, in Egypt and Italy, items are rebuffed in the ground simply because the museums are too full, theft may be ripe, preservation difficult and documentation slow. The emergence d processual archaeology under Binford and others again moved archaeology towards broader concepts of explanation, process, deduction, hypothesis testing, question setting and response. Answering questions about the organisation of societies, the environment and their life have a much greater importance today. And answering these how and why questions implies a much broader scope of work. Excavation alone cannot answer all these questions. Archaeology needs a structured research' process. This procedure is described by Renfrew and Bahn as research design. Research design has four components, namely: formulation, the collection and recording, processing and analysis and publication. For example, more detailed work in the formulation part can focus lines of enquiry into a specific area and thereby again reduce the amount of excavation required. As the questions currently posed by Archaeologists tend to be more 'strategic' the focus of the field work is also of a strategic nature. Overall landscapes, context, trading patterns and systems are more important than individual sites. As such this requires different techniques. AS Greene states "field work today is rarely directed at a single site. It usually forms part of a comprehensive study of an area." He continues "studies are designed to elucidate the broad agricultural, economic, and social developments".

单选题In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are visible as depressed or elevated areas, ridges or grooves, smooth or rough patches on the hard parts. The muscles most important for the activities of the animal and most evident in the appearance of the living animal are those attached to the hard parts and possible to reconstruct from their attachments. Much can be learned about a vanished brain from the inside of the skull in which it was lodged. Restoration of the external appearance of an extinct animal has little or no scientific value. It does not even help in inferring what the activities of the living animal were, how fast it could run, what its food was, or such other conclusions as are important for the history of life. However, what most people want to know about extinct animals is what they looked like when they were alive. Scientists also would like to know. Things like fossil shells present no great problem as a rule, because the hard parts are external when the animal is alive and the outer appearance is actually preserved in the fossils. Animals in which the skeleton is internal present great problems of restoration, and honest restorers admit that they often have to use considerable guessing. The general shape and contours of the body are fixed by the skeleton and by muscles attached to the skeleton, but surface features, which may give the animal its really characteristic look, are seldom restorable with any real probability of accuracy. The present often helps to interpret the past. An extinct animal presumably looked more or less like its living relatives, if it has any. This, however, may be quite equivocal. For example, extinct members of the horse family are usually restored to look somewhat like the most familiar living horses — domestic horses and their closest wild relatives. It is, however, possible and even probable that many extinct horses were striped like zebras. If lions and tigers were extinct they would be restored to look exactly alike. No living elephants have much hair and mammoths, which are extinct elephants, would doubtless be restored as hairless if we did not happen to know that they had thick, woolly coats. We know this only because mammoths are so recently extinct that prehistoric men drew pictures of them and that the hide and hair have actually been found in a few specimens. For older extinct animals we have no such clues.

单选题The European Union's Barcelona summit, which ended on March 16th, was played out against the usual backdrop of noisy "anti-globalization" demonstrations and massive security. If nothing else, the demonstrations illustrated that economic liberalization in Europe--the meeting's main topic--presents genuine political difficulties. Influential sections of public opinion continue to oppose anything that they imagine threatens "social Europe", the ideal of a cradle-to-grave welfare state. In this climate of public opinion, it is not surprising that the outcome in Barcelona was modest. The totemic issue was opening up Europe's energy markets. The French government has fought hard to preserve a protected market at home for its state-owned national champion, Electricite de France (EDF). At Barcelona it made a well-flagged tactical retreat. The summiteers concluded that from 2004 industrial users across Europe would be able to choose from competing energy suppliers, which should account for "at least" 60% of the market. Since Europe's energy market is worth 350 billion ( $ 309 billion) a year and affects just about every business, this is a breakthrough. But even the energy deal has disappointing aspects. Confining competition to business users makes it harder to show that economic liberalization is the friend rather than the foe of the ordinary person. It also allows EDF to keep its monopoly in the most profitable chunk of the French market. In other areas, especially to do with Europe's tough labor markets, the EU is actually going backwards. The summiteers declared that "disincentives against taking up jobs" should be removed; 20m jobs should be created within the EU by 2010. But only three days after a Barcelona jamboree, the European Commission endorsed a new law that would give all temporary-agency workers the same rights as full-timers within six weeks of getting their feet under the desk. Six out of 20 commissioners did, unusually, vote against the measure--a blatant piece of re-regulation--but the social affairs commissioner, Anna Diamantopoulou, was unrepentant, indeed triumphant. A dissatisfied liberaliser in the commission called the directive "an absolute disaster". The summit's other achievements are still more fragile. Europe's leaders promised to increase spending on "research and development" from its current figure of 1.9% of GDP a year to 3%. But how will European politicians compel businesses to invest more in research? Nobody seems to know. And the one big research project agreed on at Barcelona, the Galileo satellite-positioning system, which is supposed to cost 3.2 billion of public money, is of dubious commercial value, since the Europeans already enjoy free access to the Americans' GPA system. Edward Bannerman, head of economics at the Centre for European Reform, a Blairite think-tank, calls Galileo "the common agricultural policy in space./

单选题 It is an astonishing fact that there are laws of nature, rules that summarize conveniently-{{U}} (1) {{/U}}qualitatively but quantitatively-how the world works. We might{{U}} (2) {{/U}}a universe in which there are no such laws, in which the 1080 elementary particles that{{U}} (3) {{/U}}a universe like our own behave with utter and uncompromising abandon. To understand such a universe we would need a brain{{U}} (4) {{/U}}as massive as the universe. It seems{{U}} (5) {{/U}}that such a universe could have life and intelligence, because being and brains{{U}} (6) {{/U}}some degree of internal stability and order. But{{U}} (7) {{/U}}in a much more random universe there were such beings with an intelligence much{{U}} (8) {{/U}}than our own, there could not be much knowledge, passion or joy. {{U}} (9) {{/U}}for us, we live in a universe that has at least important parts that are knowable. Our common-sense experience and our evolutionary history have{{U}} (10) {{/U}}us to understand something of the workaday world. When we go into other realms, however, common sense and ordinary intuition{{U}} (11) {{/U}}highly unreliable guides. It is stunning that as we go close to the speed of light our mass{{U}} (12) {{/U}}indefinitely, we shrink toward zero thickness{{U}} (13) {{/U}}the direction of motion, and time for us comes as near to stopping as we would like. Many people think that this is silly, and every week{{U}} (14) {{/U}}I get a letter from someone who complains to me about it. But it is virtually certain consequence not just of experiment but also of Albert Einstein's{{U}} (15) {{/U}}analysis of space and time called the Special Theory of Relativity. It does not matter that these effects seem unreasonable to us. We are not{{U}} (16) {{/U}}the habit of traveling close to the speed of light. The testimony of our common sense is suspect at high velocities. The idea that the world places restrictions on{{U}} (17) {{/U}}humans might do is frustrating. Why shouldn't we be able to have intermediate rotational positions? Why can't we{{U}} (18) {{/U}}faster than the speed of light? But{{U}} (19) {{/U}}we can tell, this is the way the universe is constructed. Such prohibitions not only{{U}} (20) {{/U}}us toward a little humility; they also make the world more knowable.

单选题{{B}}Text 4{{/B}} As thick-skinned elected officials go, FIFA President Joseph S. Blatter is right up there with Bill Clinton. The chief of the Zurich-based group that oversees World Cup soccer hasn't been accused of groping any interns, but that's about all he hasn't been accused of. Vote buying, mismanagement, cronyism--and that's just for starters. Yet the 66-year-old Swiss shows no sign of abandoning his campaign for a second four-year term. Blatter, a geek of dispensing FIFA'S hundreds of million in annual revenue to inspire loyalty, even stands a good chance of reelection. At least he did. Since mid-March, he has seen a credible challenger emerge in Issa Hayatou, president of the African Football Confederation. Hayatou, a 55-year-old from Cameroon, leads a group of FIFA reformers that also includes FIFA Vice-President Lennart Johansson, a Swede who lost the presidential election to Blatter in 1998. These contenders' mission: to end what they call the culture of secrecy and lack of accountability that threatens FIFA with financial disaster. Representatives of the world's 204 national soccer associations meet in Seoul on May 29, and the rebels are given a chance of unseating Blatter. But even they concede that the FIFA honcho won't be easy to dislodge. Blatter's staying power seems incredible, given the array of misdeeds attributed to him and his circle. However, there are signs that FIFA'S troubles are bigger than Blatter is saying. The insurgents have already won one victory: They persuaded the rest of the executive board to order an audit of FIFA finances. But Blatter--who claims, through a spokesman, that the accusations are a smear campaign-should not be underestimated. At least publicly, sponsors and member associations remain remarkably siient with the controversy. For example, there is no outward sign of outrage from German sports equipment maker Adidas Salomon, which is spending much of its $ 625 million marketing budget on the World Cup. "We don't expect current developments within FIFA to have a negative impact on our expectations" for the World Cup, says Michael Riehl, Adidas head of global sports marketing. The conventional wisdom is that fans don't care about FIFA politics. Says Bernd Schiphorst, president of Hertha BSC Berlin, a top-ranked German team: "I've no fear that all these discussions are going to touch the event." Still, the Olympic bribery scandals and {{U}}the doping affair in the Tour de France{{/U}} show that sleazy dealings can stain the most venerable athletic spectacle. "For the Good of the Game" is FIFA'S official motto. The next few months should show whether it rings true.

单选题The extension of democratic rights in tile first half of the nineteenth century and the ensuing decline of the Federalist establishment, a new conception of education began to emerge. Education was no longer a confirmation of a pre-existing status, but an instrument in the acquisition of higher status. For a new generation of upwardly mobile students, the goal of education was not to prepare them to live comfortably in the world into which they had been born, but to teach them new virtues and skills that would propel them into a different and better world. Education became training; and the student was no longer the gentleman-in-waiting, but the journeyman apprentice for upward mobility. In the nineteenth century a college education began to be seen as a way to get ahead in the world. The founding of the land-grant colleges opened the doors of higher education to poor but aspiring boys from non Anglo-Saxon, working-class, and lower-middle-class backgrounds. The myth of the poor boy who worked his way through college to success drew millions of poor boys to the new campuses. And with this shift, education became more vocational: its objects was the acquisition of practical skills and useful information. For the gentleman-in-waiting, virtue consisted above all in grace and style, in doing well what was appropriate to his position; education was merely a way of acquiring polish. And vice was manifested in gracelessness, awkwardness, in behaving inappropriately, discourteously, or ostentatiously. For the apprentice, however, virtue was evidenced in success through hard work The requisite qualities of character were not grace or style, but drive, determination, and a sharp eye for opportunity. While casual liberality and even prodigality characterized the gentleman, frugality, thrift, and self-control came to distinguish the new apprentice And while the gentleman did not aspire to a higher station because his station was already high, the apprentice was continually becoming, striving, struggling upward. Failure for the apprentice meant standing still, not rising.

单选题The basic problem of health-care systems in Britain as pointed out by the writer seems to lie in

单选题Niagara is an Indian word which means "roaring water". Indeed, the roar of the falling water of Niagara can be heard (1) a distance of 5 kms. Imagine (2) of water flowing over a cliff 90 feet high and you will get an idea of that terrible noise. And (3) tremendous power the Niagara River has! It moves big rocks about and throws them into the boiling water below. (4) ago an old ship without single person on board was put in mid-stream. It sailed down the river (5) a toy boat with great speed. Having reached the fall, the ship dropped into the boiling water, never (6) again. There were some people who wanted to become famous (7) swimming across the most dangerous part of the Niagara River. One of them was Captain Webb who said that he would try to swim cross the Niagara, which (8) crowds of people. On the evening of July 1st, 1893, Captain Webb came up to the river and (9) a plunge. His having jumped into the water (10) many people with horror. Soon, he appeared in the middle of the river. A loud shout went up from the crowd, but a moment later there was (11) silence. The man had disappeared under the water. Thousands of eyes (12) on the river, but the man was drowned. In 1902, a certain Miss Taylor decided to go over the falls in a barrel. There were different kinds of pillows inside the barrel to prevent her from (13) . Having examined the barrel carefully, Miss Taylor got in. The barrel was closed and then (14) into the water. Having reached the falls, it overturned and was shot down by the terrible (15) of the water. When the barrel was finally caught and opened, Miss Taylor came out alive (16) with a frightened look in her eyes. Once a crowd of visitors saw a rope (17) over from one bank of the river to the other. Then they saw a man (18) the rope. The man was an actor, Blondin (19) . He managed to cross Niagara Falls on a tight rope. The people on the bank were surprised at his (20) it so well.

单选题Specialization is encouraged because______

单选题Nuclear fission is the splitting of the nucleus of an atom. Only a few elements are suitable for use in this way, the most important ones being Uranium-235, Uranium-233, and Plutonium-239. When a nucleus of one of these elements is struck by a free neutron it breaks down into two lighter nuclei which fly apart at high speed, colliding with surrounding atoms. Their kinetic energy is converted into heat energy. At the same time, two or three free neutrons are released and one of them enters the nucleus of a neighbouring atom, causing fission to occur again; and so on. The reaction spreads very quickly, with more and more heat energy released. This is called a "chain" reaction because the splitting of each nucleus is linked to another, and another and another. If this reaction takes place in an atomic bomb, where nothing is done to slow it down, the result is a violent explosion that can destroy a town in a few seconds. Fission can also, however, take place within a construction called a nuclear reactor, or atomic pile. Here the highly fissile material (U-235, U-233, Pu-239) is surrounded by a substance that is non-fissile, for instance graphite. This material is called a moderator. The neutrons lose some of their energy and speed through colliding with the atoms of the moderator. Energy—heat energy—is still created on an enormous scale, but no expansion takes place. The moderator has another function: by slowing down the speed of the free neutrons, it makes it more likely that one of them will collide with the nucleus of a neighbouring atom to continue the chain reaction. The chief advantage of nuclear energy is that it does not depend on any local factors. A nuclear reactor, unlike an oil-well or a coalmine, does not have to be sited on top of a fossil-fuel source; unlike the solar energy unit, it does not have to go out of production when the sun is not shining; unlike hydro-electric power, it does not depend on a large flow of water which may be reduced during some seasons of the year. With an atomic power station, the only limiting factor is that of safety. In the opposite process, nuclear fusion, two nuclei come together, to form a new nucleus of a different kind and this process also releases energy on an enormous scale. Fusion can only occur under conditions of very great heat—at least 50000000 degrees Celsius. (The temperature at the centre of the sun is estimated as 130000000 degrees Celsius.) A fusion reaction on earth has already been created—the hydrogen bomb. This is an uncontrolled reaction. It is not yet possible to produce a controlled fusion reaction that can be used for the production of useful energy. Nuclear energy can be thought of as a kind of square, Three of the quarters of the square are known and used, but the fourth cannot yet be used.

单选题Teach for America (TFA) was founded by Wendy Kopp in 1990. It is a non-profit organisation that recruits top-notch graduates from elite institutions and gets them to teach for two years in struggling state schools in poor areas. I had thought the programme was about getting more high-quality teachers — but that, it appears, is a secondary benefit. “This is about enlisting the energy of our country’s future leaders in its long-term educational needs, and eliminating inequity,” Wendy explains. It’s great if “corps members”, as TFA calls its active teachers, stay in the classroom — and many do, and rise quickly through the ranks. But the “alums”, as she calls those who have finished their two-year teaching, who don’t stay in schools often go on to lead in other fields, meaning that increasing numbers of influential people in all walks of life learn that it is possible to teach successfully in low-income communities, and just what it takes. “It means you realise that we can solve this problem.” As she continues to talk I realise that TFA is — in the best possible sense — a cult. It has its own language (“corps members”, “alums”), recruits are instilled (“We tell them that it can be done, that we know of hundreds, thousands, of teachers attaining tremendous success”), go through an ordeal (“Everyone hits the wall in week three in the classroom”), emerge transformed by privileged knowledge (“Once you know what we know — that kids in poor urban areas can excel — you can accomplish different things”) and can never leave (alumni form a growing, and influential, network). I have not seen the same zeal when talking to those on the equivalent programme in England, Teach First., in which the missionary-style language imported from America had to be toned down, because it just didn’t suit the restrained English style. But could that favour be necessary for its success? Chester, an alum, takes me to visit three TFA corps members at a middle school in the Bronx. They are impressive young people, and their zeal is evident. Two intend to stay in teaching; both want to open charter schools. One, a Hispanic woman, is working out with a friend how to educate migrant Hispanic labourers in Texas; the other would like to open a “green” charter, but in the meantime he has accepted a job with the KIPP charter group in Newark, New Jersey. All three are tired. Their classrooms are not much like the rest of the school where they work, and their heroic efforts are only supported by Chester and each other, not by their co-workers. “The first year was unbelievably bad,” one tells me. “So many years with low expectations meant a lot of resistance from the kids. Eventually they saw the power and the growth they were capable of.”