单选题Harry was ______ by a bee when he was collecting the honey.

单选题I couldn't ______ the lecture at all. It was too difficult for me. A. take on B. take in C. take over D. take upon

单选题______ the weight and the specific gravity of a body, you can calculate its volume.

单选题He cut the string and held up the two ______ to tie the box. A. segments B. sediments C. seizures D. secretes

单选题In that country, hospital doctors don't go sightseeing very often because their work______almost all their time.

单选题 Directions: For this part, you are allowed 30 minutes to write a short essay according to the following situation. You should write at least 120 words but no more than 180 words. Suppose a mild earthquake takes place in your campus, what should you do to protect yourself from being hurt?

单选题Agriculture must, therefore, ______ workers and savings to the new industrialized, urbanized sectors if a modern economy is to be achieved. A. yield B. succumb C. subject D. resort

单选题 What If Middle-Class Jobs Disappear? [A] The most recent recession in the United States began in December 2007 and ended in June 2009, according to the National Bureau of Economic Research. However, two years after the official end of the recession, few Americans would say that economic troubles are behind us. The unemployment rate, in particular, remains above 9%. Some labor market indicators, such as the proportion of long-term unemployed, are worse now than for any postwar recession. [B] There are two widely circulated narratives to explain what's going on. The Keynesian narrative is that there has been a major drop in aggregate demand. According to this narrative, the slump can be largely cured by using monetary and fiscal(财政的) stimulus. The main anti-Keynesian narrative is that businesses are suffering from uncertainty and over-regulation. According to this narrative, the slump can be cured by having the government commit to and follow a more hands-off approach. [C] I want to suggest a third interpretation. Without ruling out a role for aggregate demand or for the regulatory environment, I wish to suggest that structural change is an important factor in the current rate of high unemployment. The economy is in a state of transition, in which the middle-class jobs that emerged after World War II have begun to decline. As Erik Brynjolfsson and Andrew McAfee put it in a recent e-book Race Against the Machine: 'The root of our problems is not that we're in a great recession, or a great stagnation(停滞), but rather that we are in the early throes(阵痛) of a great restructuring.' [D] In fact, I believe the Great Depression of the 1930s can also be interpreted in part as an economic transition. The impact of the internal combustion engine (内燃机) and the small electric motor on farming and manufacturing reduced the value of uneducated laborers. Instead, by the 1950s, a middle class of largely clerical(从事文秘工作的) workers was the most significant part of the labor force. Between 1930 and 1950, the United States economy underwent a great transition. Demand fell for human effort such as lifting, squeezing, and hammering. Demand increased for workers who could read and follow directions. The evolutionary process eventually changed us from a nation of laborers to a nation of clerks. [E] The proportion of employment classified as 'clerical workers' grew from 5.2% in 1910 to a peak of 19.3% in 1980. (However, by 2000 this proportion had edged down to 17.4%.) Overall, workers classified as clerical workers, technical workers, managers and officials exceeded 50% of the labor force by 2000. Corresponding declines took place in the manual occupations. Workers classified as laborers, other than farm hands or miners, peaked at 11.4% of the labor force in 1920 but were barely 6% by 1950 and less than 4% by 2000. Farmers and farm laborers fell from 33% of the labor force in 1910 to less than 15% by 1950 and only 1.2% in 2000. [F] The introduction of the tractor and improvements in the factory rapidly reduced the demand for uneducated workers. By the 1930s, a marginal farm hand could not produce enough to justify his employment. Sharecropping, never much better than a subsistence occupation, was no longer viable(可行的). Meanwhile, machines were replacing manufacturing occupations like cigar rolling and glass blowing for light bulbs. [G] The structural-transition interpretation of the unemployment problem of the 1930s would be that the demand for uneducated workers in the United States had fallen, but the supply remained high. The high school graduation rate was only 8.8% in 1912 and still just 29% in 1931. By 1950, it had reached 59%. With a new generation of workers who had completed high school, the mismatch between skills and jobs had been greatly reduced. [H] What took place after World War II was not the revival of a 1920s economy, with its small farming units, urban manufacturing, and plurality of laborers. Instead, the 1950s saw the creation of a new suburban economy, with a plurality of white-collar workers. With an expanded transportation and communications infrastructure(基础设), businesses needed telephone operators, shipping clerks and similar occupations. If you could read, follow simple instructions, and settle into a routine, you could find a job in the post-war economy. [I] The trend away from manual labor has continued. Even within the manufacturing sector, the share of production and non-supervisory workers in manufacturing employment went from over 85% just after World War II to less than 70% in more recent years. To put this another way, the proportion of white-collar work in manufacturing has doubled over the past 50 years. On the factory floor itself, work has become less physically demanding. Instead, it requires more cognitive skills and the ability to understand and carry out well-defined procedures. [J] As noted earlier, the proportion of clerical workers in the economy peaked in 1980. By that date, computers and advanced communications equipment had already begun to affect telephone operations and banking. The rise of the personal computer and the Internet has widened the impact of these technologies to include nearly every business and industry. [K] The economy today differs from that of a generation ago. Mortgage and consumer loan underwriters(风险评估人) have been replaced by credit scoring. Record stores have been replaced by music downloads. Book stores are closing, while sales of books on electronic readers have increased. Data entry has been moved off shore. Routine customer support also has been outsourced(外包) overseas. [L] These trends serve to limit the availability of well-defined jobs. If a job can be characterized by a precise set of instructions, then that job is a candidate to be automated or outsourced to modestly educated workers in developing countries. The result is what David Autor calls the polarization of the American job market. [M] Using the latest Census Bureau data, Matthew Slaughter found that from 2000 to 2010 the real earnings of college graduates (with no advanced degree) fell by more in percentage terms than the earnings of high school graduates. In fact, over this period the only education category to show an increase in earnings was those with advanced degrees. [N] The outlook for mid-skill jobs would not appear to be bright. Communications technology and computer intelligence continue to improve, putting more occupations at risk. For example, many people earn a living as drivers, including trucks and taxicabs. However, the age of driverless vehicles appears to be moving closer. Another example is in the field of education. In the fall of 2011, an experiment with an online course in artificial intelligence conducted by two Stanford professors drew tens of thousands of registrants(报名者). This increases the student-teacher ratio by a factor of close to a thousand. Imagine the number of teaching jobs that might be eliminated if this could be done for math, economics, chemistry, and so on. [O] It's important to bear in mind that when we offer a structural interpretation of unemployment, a 'loss of jobs' means an increase in productivity. Traditionally, economists have argued that productivity increases are a good thing, even though they may cause unemployment for some workers in the short run. In the long run, the economy does not run out of jobs. Rather, new jobs emerge as old jobs disappear. The story we tell is that average well-being rises, and the more people are able to adapt, the more widespread the improvement becomes.

单选题Pepys and his wife Jane had asked some friends to dinner on Sunday, September 2nd, 1666. They were up very late on the Saturday evening, getting everything ready for the next day, and while they were busy they saw the glow of a fire start in the sky. By 3 o'clock on the Sunday morning, its glow had become so bright that Jane woke her husband to watch it. Pepys slipped on his dressing gown and went to the window to watch it. It seemed fairly far away, so after a time he went back to bed. When he got up in the morning, it looked, as though the fire was dying down, though he could still see some flames. So he set to work to tidy his room and put his things back where he wanted them. While he was doing this, Jane came in to say that she had heard the fire was a bad one; three hundred houses had been burned down in the night and the fire was still burning. Pepys went out to see for himself. He went to the Tower of London and climbed up on a high part of the buildings so that he could see what was happening. From there, Pepys could see that it was, indeed, a bad fire and that even the houses on London Bridge were burning. The man of the Tower told him that the fire had started in a baker's shop in Pudding Lane; the baker's house had caught fire from the overheated oven and then the flames had quickly spread to the other houses in the narrow lane. So began the Great Fire of London, a fire that lasted nearly five days, destroyed most of the old city and ended, so it is said, at Pie Corner.

单选题What may happen if we cannot hear ourselves think?

单选题You can stay here ( ) you keep quiet.

单选题Your handwriting is ______mine.

单选题It is a source of continuing frustration that sometimes, after huge amounts of resources have gone into securing successful ______, career criminals often seem to be free after little more than a third or half of their sentences. A. convictions B. decisions C. vanquisher D. agreements

单选题The gloves were really too small, and it was only by ______ them that I can get them on.

单选题With a rapidly changing and ever-increasing customer expectations, it is time to rethink customer service training.

单选题 Biologically, there is only one quality which distinguishes us from animals: the ability to laugh. In a universe which appears to be utterly deficient of humor, we enjoy this supreme luxury. And it is a luxury, for unlike any other bodily process, laughter does not seem to serve a biologically useful purpose. In a divided world, laughter is a unifying force. Human beings oppose each other on a great many issues. Nations may disagree about systems of government and human relations may be plagued by ideological clans and political camps, but we all share the ability to laugh. And laughter, in turn, depends on that most complex and subtle of all human qualities: a sense of humor. Certain comic stereotypes have a universal appeal. This can best be seen from the world-wide popularity of Charlie Chaplin's early films. As that great commentator on human affairs, Dr. Samuel Johnson, once remarked, 'Men have been wise in very different modes but they have always laughed in the same way.' A sense of humor may take various forms and laughter may be anything from refined tinkle (清脆的声响) to an earth quaking roar, but the effect is always the same. Humor helps us to maintain a correct sense of values. It is the one quality which political fanatics (狂热者) appear to lack. If we can see the funny side, we never make the mistake of taking ourselves too seriously. We are always reminded that tragedy is not really far removed from comedy, so we never get one-sided view of things.' This is one of the chief functions of satire (讽刺) and irony. Human pain and suffering are so grim; we hover so often on the brink of war, political realities are usually enough to plunge us into total despair. In such circumstances, cartoons and satirical accounts of serious political events redress the balance. They take the wind out of arrogant politicians who have lost their sense of proportion. They enable us to see that many of our most profound actions are merely comic or absurd. We laugh when a great satirist like Swift writes about war in Gulliver's Travels. The Lilliputians and their neighbors attack each other because they can't agree which end to break an egg. We laugh because we are meant to laugh; but we are meant to weep too. The sense of humor must be singled out as man's most important quality because it is associated with laughter. And laughter, in turn, is associated with happiness. Courage, determination, initiative—these are qualities we share with other forms of life. But the sense of humor is uniquely human. If happiness is one of the great goals of life, then it is the sense of humor that provides the key.

单选题The policemen went into action ______ they heard the alarm. A. promptly B. presently C. quickly D. directly

单选题The use of heat pumps has' been held back largely by skepticism about advertisers' claims that heat pumps can provide as many as units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation. Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, low-pressure vapor, enters compressor driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body or air. Now the refrigerant, as a high-pressure, cooled liquid, confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second heat exchanger, the evaporator, which transfers heat from the air to the refrigerant, reducing the temperature of this second body of air. Of the two heat exchangers, one is located inside, and the other one outside the house, so each is in contact with a different body of air: room air and outside air, respectively. The flow direction of refrigerant through a heat pump is controlled by valves. When the refrigerant flow is reversed, the heat exchangers switch function. This flow-reversal capability allows heat pumps--either to heat or cool room air. Now, if under certain conditions a heat pump puts out more thermal energy than it consumes in electrical energy, has the law of energy conservation been challenged? No, not even remotely: the additional input of thermal energy into the circulating refrigerant via the evaporator accounts for the difference in the energy equation. Unfortunately, there is one real problem. The heating capacity of a heat pump decreases as the outdoor temperature falls. The drop in capacity is caused by the lessening amount of refrigerant mass moved through the compressor at one time. The heating capacity is proportional to this mass flow rate: the less the mass of refrigerant being compressed, the less the thermal load it can transfer through the heat-pump cycle. The volume flow rate of refrigerant vapor through the single-speed rotary compressor used in heat pumps is approximately constant., But cold refrigerant vapor entering a compressor is at lower pressure than warmer vapor. Therefore, the mass of cold refrigerant--and thus the thermal energy it carries--is less than if the refrigerant vapor were warmer before compression. Here, then, lies a genuine drawback of heat pumps: in extremely cold climates--where the most heat is needed--heat pumps are least able to supply en6ugh heat.