单选题 GPS A The Global Positioning System is a space-based triangulation system using satellites and computers to measure positions anywhere on earth. It is first and foremost a defense system developed by the United States Department of Defense, and is referred to as the 'Navigation Satellite Timing and Ranging Global Positioning System' or NAVSTAR GPS. The uniqueness of this navigational system is that it avoids the limitations of other land-based systems such as limited geographic coverage, lack of continuous 24-hour coverage, and the limited accuracies of other related navigational instruments. The high accuracies obtainable with the Global Positioning System also make it a precision survey instrument. GPS Components: the Space Segment, the Control Segment, and the User Segment. B The Space Segment of the system consists of the GPS satellites. These space vehicles (SVs) send radio signals from space. The GPS Operational Constellation consists of 24 satellites that orbit the earth in 12 hours. There are often more than 24 operational satellites as new ones are launched to replace older satellites. The satellite orbits repeat almost the same ground track (as the earth turns beneath them) once each day. The orbit altitude is such that the satellites repeat the same track and area over any point approximately each 24 hours (4 minutes earlier each day). There are six orbital planes (with four SVs in each), equally spaced (60 degrees apart), and inclined at about fifty-five degrees with respect to the equatorial (赤道的) plane. This constellation provides the user with between five and eight SVs visible from any point on the earth. C The Control Segment consists of a system of tracking stations located around the world. The Master Control facility is located at Schriever Air Force Base (formerly Falcon AFB) in Colorado. These monitor stations measure signals from the SVs which are incorporated into orbital models for each satellites. The models compute precise orbital data and SV clock corrections for each satellite. The Master Control station uploads orbital data and clock data to the SVs. The SVs then send subsets of the orbital ephemeris (星历表) data to GPS receivers over radio signals. D The GPS User Segment consists of the GPS receivers and the user community. GPS receivers change SV signals into position, speed, and time estimates. Four satellites are required to compute the four dimensions of X, Y, Z (position) and Time. GPS receivers are used for navigation, positioning, time distribution, and other research. Navigation in three dimensions is the primary function of GPS. Navigation receivers are made for aircraft, ships, ground vehicles, and for hand carrying by individuals. Precise positioning is possible using GPS receivers at reference locations providing corrections and relative positioning data for remote receivers. Surveying, geodetic control, and plate tectonic studies are examples. E Time and frequency distribution, based on the precise clocks on board the SVs and controlled by the monitor stations, is another use for GPS. Astronomical observatories, telecommunications facilities, and laboratory standards can be set to precise time signals or controlled to accurate frequencies by special purpose GPS receivers. Research projects have used GPS signals to measure atmospheric parameters. F At present the system consists of 24 satellites at an altitude of about 20,000 km having an orbital inclination of 55 degrees. The orbits are almost circular and it takes 12 hours for a satellite to complete a pass around the Earth. GPS signals are broadcast from a cluster of 24 or more earth orbiting satellites. Because the GPS signals are derived from the atomic frequency standards on board each satellite, they are widely used as a reference for time synchronization and frequency adjustment. The real time positioning accuracy of a single receiver is normally up to 100 meters horizontally and 150 meters vertically. However, various methods have been developed which enable much higher accuracy (centimeter level). G There are a variety of different types of GPS receivers on the market for commercial and public use. Prices range from $500 to $30,000, reflecting the accuracy and capabilities of the instruments. For the general outdoorsman, a good GPS receiver should have 8 satellite tracking capability and be capable of receiving the GPS satellite signals through forest covering in northern Ontario shield area; for the professional user, a minimum 8 satellite tracking capability, high memory capacity, differential GPS capability, and resistance to signal weakening under forest covering is essential; for the professional surveyor requiring high level precision and accuracy capability, they should assess the project or application for which the technology is to be used with the help of an unbiased consultant, in order to determine the most cost effective and appropriate instrument. H Small hand held navigational units at relatively low cost allow boaters and hikers to know their position within a few hundred meters. This accuracy is sufficient for recreational use. A hand held or similar mapping unit at mid-range price that is linked to a fixed broadcast base station. These units allow utility companies, municipalities and others to locate various items (telephone poles, waterlines, valves) with a positional tolerance of several meters. This is suitable for some Geographical Information Systems (GIS) mapping purposes. I GPS technology offers numerous benefits to law enforcement agencies of all types. For some agencies, the navigational capabilities offered by GPS enhance efficiency and safety. These navigational applications can be used to support a variety of policing and criminal justice functions. Other agencies use GPS positioning technologies to carry out special operations or to provide enhanced personnel safety. For example, using computerized maps of their rights given by law, cooperated with GPS, aviation personnel can determine location, speed and time. J The positioning capabilities offered by GPS may also contribute to the success of specialized law enforcement operations such as in controlling vehicles. One such program operated in Minneapolis led to a 60% reduction in auto theft after only one month. The automatic vehicle location systems can not only provide efficiency of response and help ensure officer safety, but also provide officer with accurate information concerning the best response route to an incident. What's more, they can provide officers information that allows the closest patrol officers to be dispatched to a particular incident. K Advanced Transportation Management Systems (ATMS) are heavily dependant upon GPS technology to provide data about the road system. GPS allows for law enforcement personnel to clear roadway blockages to ensure the safety of motorist. Most people associate law enforcement with the prevention, reduction, and prosecution of criminal activity. In fact, a large portion of local law enforcement resources are involved in facilitating the movement of people and vehicles in a safe manner. In conclusion, large-volume commercial applications such as cellular phones, personal communication systems, and in-vehicle navigation systems will fuel continued development of these technologies. What was ultimately the domain of the Department of Defense is rapidly becoming available for business, private, and general government use. Policing and public safety in general, will benefit from these market forces. It is clear that there are a number of GPS applications for policing.

单选题 Directions: For this part, you are allowed 30 minutes to write an essay on the importance of innovation ability. You should write at least 120 words but no more than 180 words.

单选题 Directions: For this part, you are allowed 30 minutes to write a short essay on the importance of being a civilized tourist. You should write at least 120 words but no more than 180 words.

单选题 Big is Back A Corporate giants were on the defensive for decades. Now they have the advantage again. In 1996, in one of his most celebrated phrases, Bill Clinton declared that 'the era of big government is over'. He might have added that the era of big companies was over, too. The organisation that de-freed capitalism for much of the 20th century was then in retreat, attacked by corporate raiders, annoyed by shareholders and outwitted by entrepreneurs (企业家). Great names such as Pan Am had disappeared. Others had survived only by huge bloodletting: IBM sacked 122,000 people, a quarter of its workforce, between 1990 and 1995. Everyone agreed that the future lay with entrepreneurial start-ups such as Yahoo! —which in late 1998 had the same market capitalisation with 637 employees as Boeing with 230,000. The share of GDP produced by big industrial companies fell by half between 1974 and 1998, from 36% to 17%. B Today the balance of advantage may be shifting again. To a degree, the financial crisis is responsible. It has destroyed the venture-capital market, the lifeblood of many young firms. Governments have been rescuing companies they consider too big to fail, such as Citigroup and General Motors. Recession is squeezing out smaller and less well-connected firms. But there are other reasons too, which are giving big companies a self-confidence they have not displayed for decades. C Of course, big companies never went away. There were still plenty of first-rate ones: Unilever and Toyota continued to innovate through thick and thin. And not all start-ups were models of success: Netscape and Enron promised to revolutionise their industries only to crash and burn. Nevertheless, the balance had shifted in favour of small organisations. The entrepreneurial boom was supercharged by two developments. Deregulation (撤销管制规定) opened protected markets. Some national champions, such as ATT, were broken up. Others saw their markets eaten up by swift-footed newcomers. The arrival of the personal computer in the 1970s and the internet in the 1990s created an army of successful start-ups. Steve Jobs and Steve Wozniak founded Apple Computer in 1976 in the Jobs family's garage. Microsoft and Dell Computer were both founded by teenagers (in 1975 and 1984 respectively). Larry Page and Sergey Brin started Google in Stanford dorm rooms. D But deregulation had already begun to go out of fashion before the financial crisis. The Sarbanes-Oxley act, introduced after Enron collapsed in disgrace, increased the regulatory burden on companies of all sizes, but what could be borne by the big could cripple the small. Many of today's most dynamic industries are much more friendly to big companies than the IT industry. Research in biotechnology is costly and often does not bear fruit for years. Natural-resource companies, whose importance grows as competition for resources intensifies, need to be big—hence the mining industry's consolidation. E Two further developments are shifting the balance of advantage in favour of size. One is a heightened awareness of the risks of subcontracting (转包合同). Toy companies and pet-food firms alike have found that their brands can be hurt if their suppliers turn out goods of poor quality. Big industrial companies have learned that their production cycles can be broken up if contractors are not up to the mark. Boeing, once a champion of subcontracting, has been forced to take over slow suppliers. A second is the emergence of companies that have discovered how to be entrepreneurial as well as big. These giants are getting better at minimising the costs of size (such as longer, more complex chains of managerial command) while exploiting its advantages (such as presence in several markets and access to a large talent pool). Cisco Systems is pioneering the use of its own video technology to improve communications between its employees. IBM has carded out several company-wide brainstorming exercises, recently involving more than 150,000 people, that have encouraged it to put more emphasis, for example, on green computing. Disney has successfully taken Pixar's creative magic. F You might suppose that the return of the mighty, now better equipped to crush the competition, is something to worry about. Not necessarily. Big is not always ugly just as small is not always beautiful. Most entrepreneurs dream of turning their start-ups into giants (or at least of selling them to giants for a fortune). There is a symbiosis (互利合作关系) between large and small. 'Cloud computing' would not provide young firms with access to huge amounts of computer power if big companies had not created giant servers. Biotech start-ups would go bust were they not given work by giants with deep pockets. G The most successful economic ecosystems contain a variety of big and small companies: Silicon Valley boasts long-established names as well as an ever-changing array of start-ups. America's economy has been more dynamic than Europe's in recent decades not just because it is better at giving birth to companies but also because it is better at letting them grow. Only 5% of European Union companies born since 1980 have made it into the list of the 1,000 biggest in the EU by market capitalisation. In America, the figure is 22%. H The return of the giants could well be a blessing for the world economy—but only if business people and policymakers avoid certain mistakes. Businesses should not admire size blindly, particularly if this means diversifying into a lot of unrelated areas. The model of joint business may be tempting when cash is hard to find. But the moment will not last. By and large, the most successful big firms focus on their core businesses. I Policymakers should both resist an instinctive suspicion of big companies and avoid the old error of embracing national champions. It is bad enough that governments have diverted resources into supporting failing companies such as General Motors. It would be even more regrettable if they were to return to picking winners. The best use of their energies is to remove the burdens and barriers which prevent entrepreneurs from starting businesses and turning small companies into big ones.

单选题 在中国，裸婚，即无房产结婚，正被越来越多的年轻人认可。但随着年龄的增长，他们的态度会改变。结婚前通常要先办理房贷。人们普遍认为，一个男性及其家庭若无力购房，他将很难找到新娘。根据最近一份对中国沿海城市年轻人的调查，三分之一的女性择偶时会考虑对方的购房能力。就算女性自己不考虑该条件，她的家人和朋友，更不用说中国房产商，都不会让她忘记这点。

单选题 Green Growth A．The enrichment of previously poor countries is the most inspiring development of our time. It is also worrying. The environment is already under strain. What will happen when the global population rises from 7 billion today to 9.3 billion in 2050, as demographers(人口统计学家) expect, and a growing proportion of these people can afford goods that were once reserved for the elite? Can the planet support so much economic activity? B．Many policymakers adopt a top-down and Western-centric approach to such planetary problems. They discuss ambitious regulations in global forums, or look to giant multinationals and wealthy NGOs to set an example. But since most people live in the emerging world, it makes sense to look at what successful companies there are doing to make growth more sustainable. C．A new study by the World Economic Forum (WEF) and the Boston Consulting Group (BCG) identifies 16 emerging-market firms that they say are turning eco-consciousness into a source of competitive advantage. These highly profitable companies (which the study calls 'the new sustainability champions') are using greenery to reduce costs, motivate workers and forge relationships. Their home-grown ideas will probably be easier for their peers to copy than anything cooked up in the West. D．The most outstanding quality of these companies is that they turn limitations (of resources, labor and infrastructure) into opportunities. Thus, India's Shree Cement, which has long suffered from water shortages, developed the world's most water-efficient method for making cement, in part by using air-cooling rather than water-cooling. Manila Water, a utility in the Philippines, reduced the amount of water it was losing, through wastage and illegal tapping, from 63% in 1997 to 12% in 2010 by making water affordable for the poor. Broad Group, a Chinese maker of air conditioners, taps the waste heat from buildings to power its machines. Zhangzidao Fishery Group, a Chinese aquaculture (水产养殖 ) company, recycles uneaten fish feed to fertilize crops. E．Setting green goals is a common practice. Sekem, an Egyptian food producer, set itself the task of cultivating desert land through organic farming. Florida Ice Farm, a Costa Rican food and drink company, has adopted strict standards for the amount of water it can consume in producing drinks. F．These firms measure themselves by their greenery, too. Florida Ice Farm, for example, links 60% of its boss's pay to the triple bottom line of 'people, planet and profit'. The sustainability champions also encourage their workers to come up with green ideas. Natura, a Brazilian cosmetics company, gives bonuses to staff who find ways to reduce the firm's impact on the environment. Masisa, a Chilean forestry company, invites employees to 'imagine unimaginable businesses' aimed at poorer consumers. Woolworths, a South African retailer, claims that many of its best green ideas have come from staff, not bosses. G．In emerging markets it is hard for companies to stick to one specialism, because they have to worry about so many wider problems, from humble infrastructure to unreliable supply chains. So the sustainability champions seek to shape the business environment in which they operate. They lobby(游说) regulators: Grupo Balbo, a Brazilian organic-sugar producer, is working with the Brazilian government to establish a certification system for organic products. They form partnerships with governments and NGOs. Kenya's Equity Bank has formed an alliance with groups such as The International Fund for Agricultural Development to reduce its risks when lending to smallholders. Natura has worked with its suppliers to produce sustainable packaging, including a new 'green' plastic derived from sugar cane. H．The firms also work hard to reach and educate poor consumers, often sacrificing short-term profits to create future markets. Masisa organizes local carpenters into networks and connects them to low-income furniture buyers. Broad Group has developed a miniature device for measuring air pollution that can fit into mobile phones. Jain Irrigation, an Indian maker of irrigation systems, uses dance and song to explain the benefits of drip irrigation to farmers who can't read. Suntech, a Chinese solar-power company, has established a low-carbon museum to celebrate ways of reducing carbon-dioxide emissions. Rich because green, or green because rich? I．One could disagree with BCG's analysis. Phil Rosenzweig of Switzerland's IMD business school has argued that management writers are prone to 'the halo effect': they treat the temporary success of a company as proof that it has discovered some eternal principle of good management. The fact that some successful companies have embraced greenery does not prove that greenery makes a firm successful. Some firms, having prospered, find they can afford to go green. Some successful firms pursue greenery for public-relations purposes. And for every sustainable emerging champion, there are surely 100 firms that have prospered by releasing waste gas into the air or pumping toxins into rivers. J．Nonetheless, the central message of the WEF-BCG study—that some of the best emerging-world companies are combining profits with greenery—is thought-provoking. Many critics of environmentalism argue that it is a rich-world luxury: that the poor need adequate food before they need super-clean air. Some even see greenery as a rich-world trick: the West grew rich by industrializing (and polluting), but now wants to stop the rest of the world from following suit. The WEF-BCG report demonstrates that such fears are overblown. Emerging-world companies can be just as green as their Western rivals. Many have found that, when natural resources are scarce and consumers lack money, greenery can be a profitable business strategy.

单选题Adults who had been fed plenty of fruit when they were children are less likely to suffer from certain types of cancer, British scientists said on Wednesday. A medical study of 28 4,000 men and women showed that the more fruits the adults had eaten when they were 29 the less likely they were to suffer from lung, bowel and breast cancer. 'This study shows that childhood fruit consumption may have a long term 30 effect on cancer risk in adulthood,' Dr. Maria Maynard of the Medical Research Council in London said. All of the adults in the study had filled in a food 31 during the 1930s for a research study looking into the eating habits of families in 32 and urban areas of England and Scotland. Maynard and her colleagues studied the medical records of the group up to July 2000, by which time 483 cases of cancer had been 33 . In addition to fewer cases of cancer, a high consumption of fruit was 34 with a lower death rate from all causes. Fruits are loaded with antioxidants, vitamins and other nutrients, which can help to prevent genetic 35 that can lead to the development of cancer. The scientists also studied the 36 of vitamins C, E and beta carotene on cancer but they did not find any 37 that individual antioxidants were as protective as fruit. A. impact B. efficiency C. associated D. insert E. protective F. furthermore G. decent H. diagnosed I. damage J. young K. Inventory L. rural M. nearly N. evidence O. grab