单选题Overall, it is going to become much easier for people to communicate ______ the Net. Communicating with others in real time will soon be the norm.

单选题The Japanese dollar-buying makes traders eager to ______ dollars in fear of another government intervention.

单选题The Atmosphere The atmosphere is a mixture of several gases. There are about ten chemical elements which remain permanently in gaseous form in the atmosphere under all natural conditions. Of these permanent gases, oxygen makes up about 21 percent and nitrogen about 78 percent. Several other gases, such as argon, carbon dioxide, hydrogen, neon, krypton and xenon, comprise the remaining one percent of the volume of the dry air. The amount of water vapor and its variations in amount and distribution is of extraordinary importance in weather changes. Atmospheric gases hold in suspension great quantities of dust, pollen, smoke and other impurities which are always present in considerable, but variable amounts. The atmosphere has no definite upper limits but gradually thins until it becomes imperceptible. Until recently it was assumed that the air above the first few miles gradually grew thinner and colder at a constant rate. It was also assumed that upper air had little influenceon weather changes. Recently studies of the upper atmosphere, currently being conducted by earth satellites and missile probing, have shown these assumptions to be incorrect. The atmosphere has three well-defined strata. The layer of the air next to the earth, which extends upward for about ten miles, is known as the troposphere (对流层). On the whole, it makes up about 75 percent of all the weight of the atmosphere. It is the warmest part of the atmosphere because most of the solar radiation is absorbed by the earth"s surface which warms the air immediately surrounding it. A steady decrease of temperature with the increasing elevation is a most striking characteristic. The upper layers are colder because of their greater distance from the earth"s surface and rapid radiation of heat into space. The temperatures within the troposphere decrease about 3.5 degrees per 1,000 feet increase in altitude. Within the troposphere, winds and air currents distribute heat and moisture. Strong winds, called jet streams are located at the upper levels of the troposphere. These jet streams are both complex and widespread in occurrence. They normally show a wave shaped pattern and move from west to east at velocities of 150 mph, but velocities as 400 mph have been noted. The influences of changing locations and strengths of jet streams upon weather conditions and patterns are no doubt considerable. Current intensive research may eventually reveal their true significance. Above the troposphere to a height of about 50 miles is a zone called the stratosphere. The stratosphere is separated from the troposphere by a zone of uniform temperatures called the tropopause. Within the lower portions of the stratosphere is a layer of ozone gases which filter out most of the ultraviolet rays from the sun. The ozone layer varies with air pressure. If this zone were not there, the full blast of the sun"s ultraviolet light would burn our skins, blind our eyes and eventually result in our destruction. Within the stratosphere, the temperature and atmospheric composition are relatively uniform. The layer upward of about 50 miles is the most fascinating but the least known of the three strata. It is called the ionosphere because it consists of electrically charges particles called ions, thrown from the sun. The northern lights (aurora borealis) originate within this highly charged portion of the atmosphere. Its effect upon weather conditions, if any, is as yet unknown. A. a layer of ozone gases. B. about 42 degrees colder than on the ground. C. earth satellites. D. less than 1% of xenon by volume. E. jet planes. F. is warmed by the earth"s heat. G. 50 miles above the troposphere.

单选题Try and calm yourself, ______ your mind will be easy again. A. and B. or C. when D. before

单选题With lasers scientists can probe many physical processes, such as combustion, once beyond our Uken/U.

单选题In a sample of associates at a law firm, 30 percent are second-year associates, and 60 percent are not first-year associates. What percentage of the associates at the law firm have been there for more than two years? A. 10 B. 20 C. 30 D. 40 E. 50

单选题Politicians should never lose ______ of the needs of the people they represent

单选题The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage. The collapse of the stock "bubble" of Internet-related companies in 2000-2001 has resulted in more than its fair share of analysis, hand-wringing, and finger-pointing. A panel discussion at a recent Technology Today conference in Santa Monica produced a heated debate between two former luminaries of the dot.corn world: investment banker Pat Verhofen and Sue Mickelson, founder and CEO of Internet retailer Frizbeez.com. Verhofen fired the opening shot by placing blame for the collapse of Internet stocks on the shoulders of Internet entrepreneurs who aggressively promoted ideas without viable business models. These entrepreneurs were both irresponsible and deceptive, Verhofen argued, to take investors' money to fund operations that could not reasonably turn a profit, such as giving computers away for free or selling bulky objects, such as dog food or furniture, over the Internet. Many of these companies, he suggested, were little more than arrangements of smoke and mirrors designed to separate investors from their money. Mickelson responded that Verhofen was like a fox in a henhouse blaming the rooster for all the dead chickens. Entrepreneurs cannot be blamed, she argued, for trying to make money for themselves and other people, because that is what entrepreneurs do. She also stated that you cannot know what ideas will or will not work until you try them; contemporaries of the Wright brothers said that a heavier-than-air aircraft could never work, and look at the skies today. Mickelson instead placed the blame on the unscrupulous bankers and fund managers who hyped Internet stocks in order to cash in on fees from IPOs and trades. In contrast to entrepreneurs, these financial types actually do have a responsibility to offer only sound financial advice to their clients. If anyone should bear the blame, she argued, it should be people like Pat Verhofen. Indigo Smith, the moderator of the panel, responded that perhaps the true fault lay with the common investors, who should not have invested in technology stocks in the first place if they lacked the knowledge to do so properly. While she expressed sympathy for those elderly investors who lost substantial portions of their retirement savings on flimsy Internet stocks, she observed that no one forced them to invest in those stocks.

单选题Some sufferers will quickly be restored to perfect health, ______ others will take a longer time.

单选题Theflattriangularlotdepictedaboveisavailablefordevelopment.If150meters,whatistheareaofthelotinsquaremeters?

单选题Thepopulationbombisa______thathasalreadyhappenedinsomepartsoftheworld,withterribleresults.

单选题The Urigor/U exhibited by the general was totally unwarranted.

单选题We tend to think of the decades immediately following World War Ⅱ as a time of prosperity and growth, with soldiers returning home by the millions, going off to college on the G. I. Bill and lining up at the marriage bureaus. But when it came to their houses, it was a time of common sense and a belief that less could truly be more. During the Depression and the war, Americans had learned to live with less, and that restraint, in combination with the postwar confidence in the future, made small, efficient housing positively stylish. Economic condition was only a stimulus for the trend toward efficient living. The phrase "less is more" was actually first popularized by a German, the architect Ludwig Mies van der Rohe, who like other people associated with the Bauhaus, a school of design, emigrated to the United States before World War Ⅱ and took up posts at American architecture schools. These designers came to exert enormous influence on the course of American architecture, but none more so than Mies. Mies"s signature phrase means that less decoration, properly organized, has more impact that a lot. Elegance, he believed, did not derive from abundance. Like other modern architects, he employed metal, glass and laminated wood—materials that we take for granted today but that in the 1940s symbolized the future. Mies"s sophisticated presentation masked the fact that the spaces he designed were small and efficient, rather than big and often empty. The apartments in the elegant towers Mies built on Chicago"s Lake Shore Drive, for example, were smaller—two-bedroom units under 1,000 square feet—than those in their older neighbors along the city"s Gold Coast. But they were popular because of their airy glass walls, the views they afforded and the elegance of the buildings" details and proportions, the architectural equivalent of the abstract art so popular at the time. The trend toward "less" was not entirely foreign. In the 1930s Frank Lloyd Wright started building more modest and efficient houses—usually around 1,200 square feet—than the spreading two-story ones he had designed in the 1890s and the early 20th century. The "Case Study Houses" commissioned from talented modern architects by California Arts & Architecture magazine between 1945 and 1962 were yet another homegrown influence on the "less is more" trend. Aesthetic effect came from the landscape, new materials and forthright detailing. In his Case Study House, Ralph Rapson may have mispredicted just how the mechanical revolution would impact everyday life—few American families acquired helicopters, though most eventually got clothes dryers—but his belief that self-sufficiency was both desirable and inevitable was widely shared.

单选题In investigating some of the processes in reading, ______ is less likely to be taken into account? A. eye movement B. the perceptual span C. garden path D. the immediacy assumption

单选题Only recently has biology begun to see itself as an information technology. An organism"s physiology and behavior are dictated largely by its genes. And those genes contain information written in code that is surprisingly similar to the digital code that computer scientists have devised for the storage and transmission of other information. There are some differences, of course. The genetic code has four elements (known as bases or letters), while a computer"s binary code has only two. And the bases of genetic code are grouped together in threes rather than in the eight-bit bytes of computing. But the similarities are so striking that biology is suddenly undergoing a serious amount of computerization. At the same time, there has been rapid progress in the machines that supply the raw material for the computer—the sequences of genetic bases to be analyzed. A single gene-sequencing machine can now read hundreds of thousands of bases per day; and newer technologies, such as "gene chips", should produce even more data to be stored and annotated for subsequent study. The result is a mind-boggling amount of information. A genetics laboratory can easily produce 100 gigabytes of data a day—that is about 20,000 times the volume of data in the complete works of Shakespeare or J. S. Bach. The analysis of such data poses problems beyond mere volume control. Computer programs must analyze what constitutes a biologically meaningful relationship between a newly discovered sequence of DNA and existing sequences stored in a central database. Programming a computer for such tasks requires both extensive knowledge of computing theory and a keen biological intuition. And there"s the rub. The real problem about the growing quantification of biology is not the change in the subject but the lack of change in its practitioners. For a sudden in pouring of data is not unique to biology. Astronomers must now deal with squillions of bits of data from automatic sky surveys; particle physicists would not have the first idea of what was going on in their machines if the results of their experiments were not processed automatically. Yet neither of these fields seems to be suffering unduly from information overload because the physical sciences are founded on number crunching. Many biologists, however, avoided the fields of astronomy or particle physics because they have, in the delicately chosen words of Sylvia Spengler of the Center for Bioinformatics and Computational Genomics in California, "some problem with mathematics." The result is that there is a desperate shortage of specialists capable of developing the tools that biologists need. What is required is genuinely new kind of scientist who is trained both in computer science and biology. It used to be said that the physicists got all the research money. Now, however, it is the biologists" budgets that are growing. But there is a price. As biology becomes numerically rigorous , its practitioners have no choice but to do the same.

单选题In a survey conducted by research firm Harris Interactive, 71% of Americans said that spending extra money on travel during the holiday season is worthwhile—so long as it affords them time with family and friends. But just because traveling may be the right thing to do, that doesn"t mean it has to be the expensive thing to do. Traveling involves many hidden costs that, once you"re aware of them, are easy to spot—and even easier to eliminate. To start, consider transportation fees. For example, if you"re driving, fill up the gas tank before traveling on the highway, where it"s much costlier, says Clarky Davis, a personal finance expert. And make sure your car is in good condition by checking your heating vents, keeping up with routine maintenance and ensuring your tires are properly inflated, all of which help the car achieve favorable fuel economy. Furthermore, not only does a tow car (救援车) cause inconvenience; it also means extra costs. For those opting to fly, first, be aware of how much it costs to check a bag. Most airlines are charging for every checked bag by weight, but prices vary from carrier to carrier. If you can manage to pack everything into a carry-on, you"ll save at least $15. Brooke Ferencsik, a travel expert, suggests considering secondary airports when booking your flight. These airports often are less crowded and frequently offer cheaper tickets. And when it comes to your actual destination, don"t assume that hotels are going to cut back on fees simply because they"re desperate to draw customers. "They won"t be adding or increasing fees, but they won"t be decreasing them either," says Ferencsik. The best defense against extra fees is to read about the hotel"s rates online, before you make a reservation. "Be aware of surcharges for everything from housekeeping to grounds keeping to use of the in-room safe," says Ferenesik. Some hotels even install a sensor (传感器) within the mini bar, charging guests for simply touching the items, let alone eating or drinking them. "From airlines to hotels to rental cars, they"ve all got hidden fees you need to be aware of," says Ferencsik. "Do your homework and ask questions."

单选题The incomplete table above shows a distribution of scores for a class of 25 students. If the average (arithmetic mean) score for the class is 83, what score is missing from the table? Score Number of students 92 4 91 6 ? 3 83 7 71 5 A. 75 B. 77 C. 81 D. 84 E. 86

单选题To be considered grade AA, an egg must weigh between 75 and 90 grams, including the shell. Shells of grade AA eggs weigh between 3 and 5 grams. What is the smallest possible mass, in grams, of a 12-egg omelet, assuming that only grade AA eggs are used, the shells are all discarded, and no mass is lost in the cooking process? A. 800 B. 840 C. 864 D. 900 E. 1,080

单选题Marcella has 25 pairs of shoes. If she loses 9 individual shoes, what is the greatest number of matching pairs she could have left? A. 21 B. 20 C. 19 D. 16 E. 15

单选题"The world"s environment is surprisingly healthy. Discuss." If that were an examination topic, most students would tear it apart, offering a long list of complaints, from local smog (烟雾) to global climate change, from the felling (砍伐) of forests to the extinction of species. The list would largely be accurate, the concern legitimate. Yet the students who should be given the highest marks would actually be those who agreed with the statement. The surprise is how good things are, not how bad. After all, the world"s population has more than tripled during this century, and world output has risen hugely, so you would expect the earth itself to have been affected. Indeed, if people lived, consumed and produced things in the same way as they did in 1900 (or 1950, or indeed 1980), the world by now would be a pretty disgusting place: smelly, dirty, toxic and dangerous. But they don"t. The reasons why they don"t, and why the environment has not been ruined, have to do with prices, technological innovation, social change and government regulation in response to popular pressure. That is why today"s environmental problems in the poor countries ought, in principle, to be solvable. Raw materials have not run out, and show no sign of doing so. Logically, one day they must: the planet is a finite place. Yet it is also very big, and man is very ingenious. What has happened is that every time a material seems to be running short, the price has risen and, in response, people have looked for new sources of supply, tried to find ways to use less of the material, or looked for a new substitute. For this reason prices for energy and for minerals have fallen in real terms during the century. The same is true for food. Prices fluctuate, in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available. But they always do, assisted by new farming and crop technology. The long term trend has been downwards. It is where prices and markets do not operate properly that this benign (亲戚) trend begins to stumble, and the genuine problems arise. Markets cannot always keep the environment healthy. If no one owns the resource concerned, no one has an interest in conserving it or fostering it. fish is the best example of this.