单选题In most work success is measured by income, and while our capitalistic society continues, this is inevitable. It is only where the best work is concerned that this measure ceases to be the natural one to apply. The desire that men feel to increase their income is quite as much a desire for success as for the extra comforts that a higher income can procure (获得，取得). However dull work may be, it becomes bearable if it is a means of building up a reputation whether in the world at large or only in one"s own circle. Continuity of purpose is one of the most essential ingredients of happiness in the long run, and for most men this comes chiefly through their work. In this respect those women whose lives are occupied with housework are much less fortunate than men, or than women who work outside the home. The domestic wife does not receive wages, has no means of bettering herself, is taken for granted by her husband (who sees practically nothing of what she does), and is valued by him not for her housework but for quite other qualities. Of course this does not apply to those women who are sufficiently well-to-do to make beautiful houses and beautiful gardens and become the envy of their neighbors; but such women are comparatively few, and for the great majority housework cannot bring as much satisfaction as work of other kinds bring to men and to professional women.

单选题Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of travel in the foreseeable future. The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types. Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion (拥挤). One proposed solution to this problem is the automated highway system. When the auto enters the highway system, a retractable (可伸缩的) arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the car will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car's movements. The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wak for the buzzer (蜂鸣器) that will warn of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,400 to 2,000 vehicles that can be carried by a present-day highway.

单选题Is the outcome in a monopolistically (垄断地) competitive market desirable from the standpoint of society as a whole? Can policymakers improve on the market outcome? There are no simple answers to these questions. One source of inefficiency is the markup (涨价) of price over marginal cost. Because of the markup, some consumers who value the good at more than the marginal cost of production (but less than the price) will be deterred (被阻止) from buying it. Thus, a monopolistically competitive market has the normal deadweight loss of monopoly .pricing. Although tins outcome is clearly undesirable compared to the first-best outcome of price equal to marginal cost, there is no easy way for policymakers to-fix the problem. To enforce marginal-cost pricing, policymakers would need to regulate all firms that produce differentiated products. Because such products are so common in the economy, the administrative burden of such regulation would be overwhelming. Moreover, the regulating monopolistic competitors would entail all the problems of regulating natural monopolies. In particular, because monopolistic competitors are making zero profits already, requiring them to lower their prices to equal marginal cost would cause them to make losses. To keep these firms in business, the government would need to help them cover these losses. Rather than raising taxes to pay for these subsidies, policymakers may decide it is better to live with tile inefficiency of monopolistic pricing Another way in which monopolistic competition may be socially inefficient is that the number of firms in the market may not be the "ideal" one. That is, there may be too much or too little entry. One way to think about this problem is in terms of the externalities associated with entry. Whenever a new firm considers entering the market with a new product, it considers only the profit it would make. Yet its entry would also have two external effects: a) The product-variety externality: Because consumers get some consumer surplus from the introduction of a new product, there is a positive externality associated with entry b) The business-stealing externality: Because other firms lose customers and profits from the entry of a new competitor, there is a negative externality associated with entry. Thus in a monopolistically competitive market, there are both positive and negative externalities associated with the entry of new firms. Depending on which externality is larger, a monopolistically competitive market could have either too few or too many products. Both of these externalities are closely related to the conditions for monopolistic competition. The former arises because a new firm would offer a product different from those of the existing firms. The latter arises because firms post a price above marginal cost and, therefore, are always eager to sell additional units. Conversely, because perfectly competitive firms produce identical goods and charge a price equal to marginal cost, neither of these externalities exists under perfect competition. In the end, we can conclude only that monopolistically competitive markets do not have all the desirable welfare properties of perfectly competitive markets. That is, the invisible hand does not ensure that total surplus is maximized under monopolistic competition. Yet because the inefficiencies are subtle, hard to measure, and hard to fix, there is no easy way for public policy to improve the market outcome.

单选题(All) fruit contains fiber: an orange provides seven, (a apple five), and a banana four, but (half of) a grapefruit (provides) six grams.

单选题We''ll visit Europe next year ______ we have enough money.

单选题An applicant with ______ may not be employed by IBM.

单选题______, he does get irritated with her sometimes. A. As he likes her B. Now that he likes her C. Though much he likes her D. Much as he likes her

单选题You should have put the milk in the icebox; I expect it ______ undrinkable by now. A. became B. had become C. becomes D. has become

单选题It's been very cold the last few days. I think the winter's ______ already.

单选题Amy Johnson was a pioneer airwoman in Britain. She was born on July 1, 1903, in Yorkshire and lived there until 1923 when she went to Sheffield University to study for a BA. After graduation she took a job as a secretary to a London lawyer. At the same time she became interested in aviation, and to succeed in some project which would prove to the world that women could be as competent as men in a male-dominated field in those days. Early in 1930, she chose her objective: to fly solo to Australia and to break the previous record of 16 days. Her parents and some of her friends lent her money to buy a used airplane. Amy set off on May 5, 1930. Her route took her over Vienna and Baghdad. She was caught in a sandstorm and had to make an emergency landing in the desert. Six days later she landed in India. After experiencing much hardship, she finally reached Australia on May 24, completing a flight of 11,000 miles. She was the first woman to fly alone to Australia. In later years, she set several other records in flight history.

单选题{{B}}练习四{{/B}} Learning disabilities are very common. They affect perhaps 10 percent of all children. Four times as many boys as girls have learning disabilities. Since about 1970, new research has helped brain scientists understand these problems better. Scientists now know there are many different kinds of learning disabilities and that they are caused by many different things. There is no longer any question that all learning disabilities result from differences in the way the brain is organized. You cannot look at a child and tell if he or she has a learning disability. There is no outward sign of the disorder. So some researchers began looking at the brain itself to learn what might be wrong. In one study, researchers examined the brain of a learning-disabled person who had died in an accident. They found two unusual things. One involved cells in the left side of the brain, which control language. These cells normally are white. In the learning-disabled person, however, these cells were gray. The researchers also found that many of the nerve cells were not in a line the way they should have been. The nerve cells were mixed together. The study was carried out under the guidance of Norman Geschwind, an early expert on learning disabilities. Doctor Geschwind proposed that learning disabilities resulted mainly from problems in the left side of the brain. He believed this side of the brain failed to develop normally. Probably, he said, nerve cells there did not connect as they should. So the brain was like an electrical device in which the wires were crossed. Other researches did not examine brain tissue. Instead, they measured the brain's electrical activity and made a man of the electrical signals. Frank Duffy experimented with this techniques at Children's Hospital Medical Center in Boston. Doctor Duffy said his research is evidence that reading disabilities involve damage to wide area of the brain, not just the left side.

单选题John couldn’t keep up with other players. He ______.

单选题When he checked in a hotel, it was already nine o' clock in the evening.

单选题Foxes and farmers have never got on well. These small dog-like animals have long been accused of killing farm animals. They are officially classified as harmful and farmers try to keep their numbers down by shooting or poisoning them. Farmers can also call on the services of their local hunt to control the fox population. Hunting consists of pursuing a fox acmes the countryside, with a group of specially trained dogs, followed by men and women riding horses. When the dogs eventually catch the fox they kill it or a hunter shoots it. People who take part in hunting think of it as a sport; they wear a special uniform of red coats and white trousers, and follow strict codes of behavior. But owning a horse and hunting regularly is expensive, so most hunters are wealthy. It is estimated that up to 100,000 people watch or take part in fox hunting. But over the last couple of decades the number of people opposed to fox hunting, because they think it is brutal(残酷的) ,has risen sharp- ly. Nowadays it is rare for a hunt to pass off without some kind of confrontation(冲突) between hunters and hunt saboteurs(阻拦者). Sometimes these incidents lead to violenee, but mostly saboteurs interfere with the hunt by misleading riders and disturbing the trail of the fox's smell ,which the dogs follow. Noisy confrontations between hunters and saboteurs have become so common that they fire almost as mach a part of hunting as the pursuit of foxes itself. But this year supporters of fox hunting face a much bigger threat to their sport. A Labour Party Member of the Parliament, Mike Foster, is trying to get Parliament to approve a new law which will make the hunting of wild animals with dogs illegal. If the law is passed, wild animals like foxes will be protected under the ban in Britain.

单选题Would you mind _______quiet for a moment? I am trying _______a form.

单选题How to talk to a Martian is Uan academic/U question.

单选题 Directions: In this part there are three passages and one advertisement, each followed by questions or unfinished statements. For each of them, there are four choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.{{B}}11-15{{/B}} Imagine a world in which children would be the rulers and could decide not only the outcome of each and every occurrence, but also dictate the very structure and form of the environment. In this world, a child's wildest thoughts would become reality, limited only by the extent of his or her imagination. While such a world might sound both fantastic and frightening, at least from a logical, adult perspective, it does exist. What's more, it has been in existence for some time and is populated by hundreds of thousands of children who spend hours within its boundaries experimenting and learning. This world is not real, at least not in the traditional sense, but exists within a computer and is generated by an educational programming language called LOGO. Unlike other computer languages and programs that are designed to test children and provide applications that formally dispense information, LOGO allows children, even preschool children, to be in total control. Children teach the computer to think and as a result develop and sharpen their own reasoning abilities.

单选题Vegetables are cheap ______ when they are in season. A. buying B. to buy C. to be bought D. to buy them