单选题Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants

单选题A.117,000B.11,700C.3,900D.1,170E.390

单选题It"s possible that while you are at work, you may dream about a month of Sundays, but your boss wishes for a week of Tuesday. That"s because he probably knows that productivity is one of the main factors bolstering a company"s growth. And a recent poll shows that workers are most productive on Tuesdays! Accountemps, an employment agency, conducted a national survey of office managers, which shows that by the middle of the week, they see a dramatic productivity decrease. While Monday is considered second in "productivity value," only nine percent of office managers think Wednesday is the peak productivity day. Five percent believe it is Thursday. And Friday, well, you can just imagine! However, forty-eight percent of the managers polled said that Tuesday is, by far, the most productive day of the week. A close analysis of workweek rhythms would turn up some obvious reasons for those survey results. First of all, Monday is overloaded with meetings, designed to "get things moving," and everybody knows meetings aren"t very productive. Wednesday is "hump day" (驼峰日) —get over it as painlessly as possible, a worker thinks, and the week is more than halfway over. On Thursday, people are running out of steam; and Friday, everybody"s thinking about the weekend. There are reasons why the other days aren"t productive, but what makes Tuesday special? Tuesdays, employees hit peak performance because they are very focused on day-to-day activities. Also, it"s usually the first day of the week when they"re focused on their own task. They"re not in meetings that take them away from their primary responsibilities. Actually, Tuesdays can be quite hectic. Workers are arriving at work fairly frantic. And so, in 10 hours, they"re doing 20-hour work. That"s productive, but it"s also tough. This does not mean that nothing happens on the last three days of the workweek. Things do not get so lax that people are sitting with their feet on desks, sipping coffee and talking on the phone all day, but there"s a definite lack of focus. The pace softens and the rhythm slows down. And this is not healthy: it produces fatigue and lowers productivity. To prevent this midweek slowdown, some management consultants suggest that employers avoid jamming so many meetings into Mondays. Work deadlines can be rescheduled to stretch out the workflow. Variations in productivity are only natural, but both workers and bosses win when the peaks and valleys are less dramatic than they are now.

单选题A car manufacturer periodically discounts certain car models to its dealers to coincide with intensive advertising campaigns focused on those cars. After analyzing the results of this program, the manufacturer found that sales of the discounted cars were strong, but it also concluded that it could reap greater profits if it did not hold promotions in this way. Which of the following statements, if true, best accounts for the manufacturer's conclusion about profitability? A. Some consumers worry that discounted cars are more likely to be defective. B. The car manufacturer had not been effective in controlling the production costs of the cars, and these rising costs ate into the manufacturer's profits. C. Although dealers requested large numbers of the cars at discounted prices, they generally sold the cars at the normal retail price, thereby keeping more of the profit for themselves. D. Many consumers buy large-ticket items, such as cars, only when they are on sale. E. The manufacturer's intensive advertising campaign did not sufficiently emphasize the cars' high levels of performance on road tests.

单选题As you can see by yourself, things ______ to be exactly as the professor had foreseen.

单选题New ice core samples taken from the centre of the Greenland ice-sheet have given a detailed record of the last "interglacial period (间冰期)" which range from about 135,000 to 115,000 years ago. The cores, taken from a depth of 2,780 to 2,870 metres, show that during this period the climate oscillated (摆动) between three stages instead of remaining in one, as in the whole of recorded human history. The middle stage was like our own, but the others were either much colder or warmer. Worse, it seems that the climate flipped from one condition to another very rapidly. "It apparently took very little time, perhaps less than a decade or two, to shift between the stages," Dr. J. CW. White of the Institute of Arctic and Alpine Research at the University of Colorado wrote earlier this year in the scientific journal, Nature. "We humans have built a remarkable socio-economic system during perhaps the only time when it could be built, when the climate was stable enough to let us develop the agricultural infrastructure (基础设施) required to maintain an advanced society." We do not know why we have been so blessed. But if the Earth had an operating manual, the chapter on climate might begin with a warning that the system has been adjusted at the factory for optimum comfort—so don"t touch the dials. Unfortunately, we have been "twiddling the knobs (旋钮)" for decades. In December 1995 the official Intergovernmental Panel on Climatic Change (IPCC), which represents the work of 2,000 top meteorologists from around the world, concluded that global warming due to human activities is probably already taking place. Global warming sounds deceptively favorable to inhabitants of countries which currently experience harsh winters. In fact, with global warming, the world would struggle to cope with the effects of even a steady, gradual warming. This was spelt out to members of the British Royal Society by Sir John Houghton, chairman both of Britain"s Royal Commission of Environmental Pollution and of one of the main IPCC working groups. Houghton put forward the IPCC picture of seas flooding much of Egypt, Southern China and Bangladesh, making "many millions" of people homeless; of hordes of "environmental refugees" and of wars breaking out over dwindling (becoming gradually smaller) fresh water supplies, as world rainfall patterns changed. There is at least a chance that the world could adapt to steady warming if it happened slowly enough. However, many scientists, believe that even this prediction from the IPCC is too cautious.

单选题A hundred years ago it was assumed and scientifically "proved" by economists that the laws of society made it necessary to have a vast army of poor and jobless people in order to keep the economy going. Today, hardly anybody would dare to voice this principle. It is generally accepted that nobody should be excluded from the wealth of the nation, either by the laws of nature or by those of society. The opinions, which were current a hundred years ago, that the poor owed their conditions to their ignorance, lack of responsibility, are outdated. In all Western industrialized countries, a system of insurance has been introduced which guarantees everyone a minimum of subsistence in case of unemployment, sickness and old age. I would go one step further and argue that, even if these conditions are not present, everyone has the right to receive the means to subsist, in other words, he can claim this subsistence minimum without having to have any "reason". I would suggest, however, that it should be limited to a definite period of time, let"s say two years, so as to avoid the encouraging of an abnormal attitude which refused any kind of social obligation. This may sound like a fantastic proposal, but so, I think; our insurance system would have sounded to people a hundred years ago. The main objection to such a scheme would be that if each person were entitled to receive minimum support, people would not work. This assumption rests on the fallacy of the inherent laziness in human nature, actually, aside from abnormally lazy people, there would be very few who would not want to earn more than the minimum, and who would prefer to do nothing rather than work. However, the suspicions against a system of guaranteed subsistence minimum are not groundless, from the standpoint of those who want to use ownership of capital for the purpose of forcing others to accept the work conditions they offer. If nobody were forced to accept work in order not to starve, work would have to be sufficiently interesting and attractive to induce one to accept it. Freedom of contract is possible only if both parties are free to accept and reject it; in the present capitalist system is not the case. But such a system would not only be the beginning of real freedom of contract between employers and employees, its principal advantage would be the improvement of freedom in interpersonal relationships in every sphere of daily life.

单选题Contrary to popular belief, epidemics do not occur ______ after a natural disaster. A. spontaneously B. simultaneously C. homogeneously D. instantaneously

单选题The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others. These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

单选题Intherectangularquadrantsystemshownabove,whichquadrant,ifany,containsnopoint(x,y)thatsatisfiestheequation3x+5y=-2?A.noneB.ⅠC.ⅡD.ⅢE.Ⅳ

单选题When Americans think of college these days, the first word that often comes to mind is "debt". And from "debt" it"s just a short hop to other unpleasant words, like "payola", "kickback", and "bribery". At least, that"s how it"s been since this spring, when news broke that student-loan companies had been using unsavory and possibly illegal tactics to get preferential treatment from university financial-aid-officers. At some universities, officers were given stock options in companies whose loans they recommended to incoming students, while at others lenders offered millions of dollars in perks to schools that would stop doing business with competitors. In response, the Senate passed a bill toughening rules against "inducements" from lenders to administrators. All well and good, but it leaves untouched a more fundamental scandal: the huge profits that lenders make from student loans are being earned on the government"s dime. For decades, student-loan companies have one of the cushiest businesses in America. We want collage students to be able to finance their education a reasonable rates. But banks are understandably leery of lending to people with no collateral and uncertain future earnings. So we provide incentives to lend. The federal government, for instance, guarantees the so-called Stafford loans that college students get if a student defaults, the government will pay off almost the entire loan. On top of that, the government hands out billions of dollars in subsidies to lenders every year, all but insuring them a steady profit. In effect, lenders get a guaranteed return with very little risk. This convoluted process is good at making student-loan companies rich-Sallie Mac, the biggest issuer of student loans, earned $1.3 billion last year, with a return on equity that dwarf most other companies. But it"s not very good at getting government money to students cheaply and efficiently. President Bush"s 2007 budget show, for instance, that it"s four times as expensive for the government to subsidize and guarantee private loans as for it to issue those loans itself. In other words, the current system is not just corrupt. It"s also inefficient. So what"s to be done? At it happens, there"s evidence in the history of student aid itself, which stretches back to the G. I. Bill, when the government committed itself to paying for the college education of returning veterans. An overwhelming success, the bill involved no middlemen: the government paid tuition fees directly to colleges. Talking of the government running anything, of course, makes people anxious, but the truth is that the government is already running the student-loan market. The problem is that up to now it"s been run in the interests of student-loan companies. Maybe it"s time to start running it in the interests of students.

单选题I decided to face the situation ______ —the paltry child support that the court had ordered my husband to pay barely kept food on the table.

单选题Idon'tskatenow,butI___________whenIwasakid.

单选题Generative‐transformationalgrammarcontainstwosetsofrules.Theyare_______.

单选题A moving company charges a flat rate of $550 for loading its trucks and an additional $20 per 1/5 mile for moves within the city. How much would a move of 2.8 miles within the city cost? A. $690 B. $790 C. $830 D. $880 E. $1,010

单选题Southern Slang Whenever I return to North Carolina, my home state in America"s Southeast, more than the familiar rolling grassland hills tells me I"m home: Back there, my ears perk up to familiar bits of Southern-style American English, a regional delicacy that has yet to sneak its way into China. "Listen up good now, because I"m fixin" to tell you all about it." I had been looking forward to a nice, big Christmas dinner for some time leading up to my most recent visit home, because I knew I would be "eating high on the hog". This Southernism, which originally meant having the luxury of eating the highest-quality parts of the pig, now simply refers to enjoying good food in large quantities. My mom"s delicious baked ham did happen to be on the table as we feasted this Christmas, but the presence of pork is hardly a necessity for eating high on the hog, nor does one have to be in the South to do so. In fact, the phrase often passes through my mind when I sit down to a steaming hot pot or a bow of Xinjiang-style noodles in Beijing. But for Southerners who enjoy good barbecued pork (and there aren"t many who don"t), there"s a great way to eat high on the hog while eating every part of it: go to "a pig pickin". A pig pickin is not so much a meal as it is an event, where people gather around a whole hog which is slow-roasted in a smoky oven until its tender meat can be, picked right off the bones and eaten. There"s only one way to describe the taste, of juicy barbecue on a summer afternoon: "finger-lickin good!" Many Southern colloquialisms reflect the agricultural heritage of the region, and so lots of Southern slang calls on images or personalities we associate with animals. After a long, hard day at work, nothing describes someone is exhausted quite as vividly as saying he or she is "clog tired", evoking an image of a lazy, long-eared hound dog lazing on a front porch. Or, if someone has a natural intelligence for understanding the ways of the world, we may say that person has "horse sense", like a trusty four-legged friend who always knows which way to go when it comes to a fork in the road. The South"s long-standing religious traditions also pepper the speech of locals. When a proper Southerner wants to express that something will happen if all goes well, he might say, "Good Lord willin" and the creek don"t rise", which recalls more primitive times when many Southern farmers relied on good weather conditions for their livelihoods. For example, one friend might say to another when arranging a weekend picnic, "Good Lord willin" and the creek don"t rise, I"ll see you on Sunday." If that weekend brings a thunderstorm, raining out the picnic, the two unlucky friends may curse the weather, calling it "god-awful". Perhaps the two uniquely Southern words that are best known in other parts of the world are "y"all", which is a shortened version of "you all", and the infamous "ain"t", which means "is not", "are not" or "am not". While, Southerners and non-Southerners will probably never stop arguing over whether or not these officially qualify as English words (they are in the dictionary, if that courts for anything), they are undeniably part of the Southern vocabulary. One of the charms of the way Southerners speaks is that they often have a multitude of colorful ways to say very simple things. If someone plans to do something Very soon, he could say any number of ways, some of which may bring a smile, to the listener"s face. Instead of saying "right away", a Southerner might substitute any of the following: "faster than you can skin a cat"; "quicker than you can say "Jack Robinson"" (don"t ask me who Jack is); "right now in a minute"; or "lickety-split". Southern-style English is something that many Americans feel very strongly about. While many natives of the South are proud of the distinction their slang brings to their speech, other English speakers often turn their noses up at the earthy, down home tone of the region"s slang. But love it or hate it, the English of the American South is full of personality and like nothing else you"ll ever hear.

单选题My new home was a long way from the centre of London but it was becoming essential to find a job, so finally I spent a whole morning getting to town and putting my name down to be considered by London Transport for a job on the tube. They were looking for guards, not drivers. This suited me. I couldn"t drive a car but thought that I could probably guard a train, and perhaps continue to write my poems between stations. The writers Keats and Chekhov had been doctors. T. S. Eliot had worked in a bank and Wallace Stevens for an insurance company. I would be a tube guard. I could see myself being cheerful, useful, a good man in a crisis. Obviously I would be overqualified but I was willing to forget about that in return for a steady income and travel privileges those being particularly welcome to someone living a long way from the city centre. The next day I sat down, with almost a hundred other candidates, for the intelligence test, I must have done all right because after half an hour"s wait I was sent into another room for a psychological test. This time there were only about fifty candidates. The examiner sat at a desk. You were signaled forward to occupy the seat opposite him when the previous occupant had been dismissed, after a greater or shorter time. Obviously the long interviews were the more successful ones. Some of the interviews were as short as five minutes. Mine was the only one that lasted a minute and a half. I can remember the questions now. "Why did you leave your last job?" "Why did you leave your job before that?" "And the one before that?" I can"t recall my answers, except that they were short at first and grew progressively shorter. His closing statement, I thought, revealed a lack of sensitivity which helped to explain why as a psychologist, he had risen no higher than the underground railway. "You have failed the psychological test and we are unable to offer you a position." Failing to get that job was my low point. Or so I thought, believing that the work was easy. Actually, such jobs—being a postman is another one I still desire—demand exactly the sort of elementary yet responsible awareness that the habitual dreamer is least qualified to give. But I was still far short of full self-understanding. I was also short of cash.

单选题The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. Ｄ. EACH statement ALONE is sufficient. Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.

单选题(23-1)(23+1)(26+1)(212+1)= A. (224-1) B. (224-1) C. (248-1) D. (296+1) E. 26(212-1)