单选题How long does it take for some industries acquiring commercial potential?

单选题On seeing the anxiety of the parents, the doctor ______ them about their son's minor operation.

单选题 {{B}}{{I}}Questions 33 to 35 are based on the passage you have just heard.{{/I}}{{/B}}

单选题 {{B}}Passage Two{{/B}}Questions 29 to 31 are based on the passage you have just heard.

单选题What does the author mean by "Homicide could take a new form"?

单选题Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked [A], [B], [C] and [D], and decide which is the best answer. Then mark the corresponding letter on Answer Sheet 2 with a single line through the center.

单选题[此试题无题干]

单选题The annual Phi Delta Kappa/Gallup poll of attitudes towards public education released this week found that a majority of Americans feel it is important to put a "qualified, competent teacher in every classroom". Bob Chase, president of the National Education Association (NEA), the main teachers' union, wasted no time in pointing out that this will require raising teachers' salaries so that more qualified candidates will enter the profession and stay there. A study by two economists suggests that the quality of America's teachers has more to do with how they are paid rather than how much. The pay of American public school. teachers is not based on any measure _of performance; instead, it is determined by a rigid formula based on experience and years of schooling. factors massively unimportant in deciding how well students do. The uniform pay scale invites what economists call adverse selection. Since the most talented teachers are also likely to be good at other professions, they have a strong incentive to leave education for jobs in which pay is more closely linked to productivity. For dullards(笨蛋), the incentives are just the opposite. The data are striking: when test scores are used as a proxy (代替物) for ability, the brightest individuals shun the teaching profession at every juncture. Clever students are the least likely to choose education as a major at university. Among students who do major in education, those with higher test scores are less likely to become teachers. And among individuals who enter teaching, those with the highest test scores are the most likely to leave the profession early. The study takes into consideration the effects of a nationwide 20% real increase in teacher salaries during the 1980s. It concludes that it had no appreciable effect on overall teacher quality, in large part because schools do a poor job of recruiting and selecting the best teachers. Also, even if higher salaries lure more qualified candidates into the profession, the overall effect on quality may be offset by mediocre teachers who choose to postpone retirement. The study also takes aim at teacher training. Every state requires that teachers be licensed, a process that can involve up to two years of education classes, even for those who have a university degree or a graduate degree in the field they would like to teach. Inevitably, this system does little to lure in graduates of top universities or professionals who would like to enter teaching at mid-career.

单选题She sat down to write her essay, but found she was completely without______.

单选题It is a commonplace among moralists that you cannot get happiness by pursuing it. This is only true if you pursue it (62) Gamblers at Monte Carlo are pursuing money, and most of them lose it instead, but there are other ways of pursuing money, which often (63) So it is with happiness. If you pursue it (64) drink, you are forgetting the hang-over (宿醉). Epicurus pursued it by living only in congenial society and eating only dry bread, (65) by a little cheese on feast days. His method proved successful in his case, but he was a valetudinarian (体弱多病的人), and most people would need something more (66) .For most people, the pursuit of happiness, (67) supplemented in various ways, is too abstract and theoretical to be (68) as a personal rule of life. But I think that (69) personal rule of life you may choose it should not, except in rare and heroic cases, be (70) with happiness. There are a great many people who have all the (71) conditions of happiness, i.e. health and a sufficient income, and who, (72) , are profoundly unhappy. In such cases it would seem as if the (73) must lie with a wrong theory as to how to live. In one sense, we may say that any theory as to how to live is wrong. We imagine ourselves more different from the animals than we are. Animals live on (74) , and are happy as long as external conditions are (75) If you have a cat it will enjoy life if it has food and warmth and opportunities for an (76) night on the tiles. Your needs are more complex than those of your cat, but they still have their basis in instinct. In civilized societies, especially in English-speaking societies, this is too (77) to be forgotten. People propose to themselves some one paramount objective, and (78) all impulses that do not minister to it. A business-man may be so (79) to grow rich that to this end he (80) health and private affections. When at last he has become rich, no (81) remains to him except harrying (折磨) other people by exhortations (训词) to imitate his noble example.

单选题The clock in the painting is a symbolic ______ of the passage of time.

单选题{{B}}Passage One Questions 26 to 28 are based on the passage you have just heard.{{/B}}

单选题Texting has long been bemoaned(哀叹)as the downfall of the written word, "penmanship for illiterates," as one critic called it. To which the proper response is LOL. Texting properly isn"t writing at all. It"s a "spoken" language that is getting richer and more complex by the year. First, some historical perspective. Writing was only invented 5,500 years ago, whereas language probably traces back at least 80,000 years. Thus talking came first; writing is just a craft that came along later. As such, the first writing was based on the way people talk, with short sentences. However, while talking is largely subconscious and rapid, writing is deliberate and slow. Over time, writers took advantage of this and started crafting long-winded sentences such as this one: "The whole engagement lasted above 12 hours, till the gradual retreat of the Persians was changed into a disorderly flight, of which the shameful example was given by the principal leaders and..." No one talks like that casually—or should. But it is natural to desire to do so for special occasions. In the old days, we didn"t much write like talking because there was no mechanism to repro-duce the speed of conversation. But texting and instant messaging do—and a revolution has begun. It involves the crude mechanics of writing, but in its economy, spontaneity and even vulgarity, texting is actually a new kind of talking, with its own kind of grammar and conventions. Take LOL. It doesn"t actually mean "laughing out loud" in a literal sense anymore. LOL has evolved into something much subtler and sophisticated and is used even when nothing is remotely amusing. Jocelyn texts "where have you been?" and Annabelle texts back "LOL at the library studying for two hours." LOL signals basic empathy (同感) between texters, easing tension and creating a sense of equality. Instead of having a literal meaning, it does something—conveying an attitude— just like the -ed ending conveys past tense rather than "meaning" anything. LOL, of all things, is grammar. Of course no one thinks about that consciously. But then most of communication operates with-out being noticed. Over time, the meaning of a word or an expression drifts—meat used to mean any kind of food, silly used to mean, believe it or not, blessed. Civilization, then, is fine—people banging away on their smartphones are fluently using a code separate from the one they use in actual writing, and there is no evidence that texting is ruining composition skills. Worldwide people speak differently from the way they write, and texting— quick, casual and only intended to be read once—is actually a way of talking with your fingers.

单选题While it can't yet be said that every mouthful of food has been changed through genetic engineering, it is likely that almost every American has had a mouthful of engineered food. Take the soybean, for example. About 55 percent of last year's crop was genetically engineered in some fashion, reports the American Soybean Association. And though few Americans sit down to a plate of soybeans for dinner, these soybeans arrive through the back door as an additive to scores of foods like cooking oils, salad dressings, coffee creamers, beer, cereals and candy. America is on the verge of a second green revolution. The first tripled world food output over the course of a mere three decades during the late 20th century. Scientists boosted crop yields by crossbreeding (杂交) related plants that add desirable traits. Then farmers added fertilizer, pesticide, and irrigation in order to make the high-yield crops thrive. Now that those gains are leveling off, scientists are looking to biotechnology to increase food production even more. This time, instead of breeding plants with their closest relatives, scientists are inserting genes. For example, genes from flounders can help ordinary plants like tomatoes and strawberries fight the cold. Researchers are also inserting bacterial genes into corn and soybean plants to better protect them from insects or render them immune to certain herbicides The technology has enormous potential. The application of biotechnology is going to produce a set of possibilities that we simply cannot conceive of, even in our most imaginative flights of fancy. For farmers, crops engineered with genes that resist cold, drought, or other adverse weather conditions can boost crop yields with less money and effort. For consumers, that could mean cheaper food. Such crops would also help feed and better nourish people in developing nations, such as drought-ridden Africa. But as these crops begin infiltrating (渗透) our food supply, environmental and consumer groups have begun to question whether potential risks to the environment and human health have been adequately studied. Last year, for example, biologists for the first time found evidence suggesting that planting genetically modified corn in open fields may kill butterflies who feed on the corn's pollen. Scientists are also questioning whether foods with a gene inserted to improve one area of their performance could prove detrimental in another: For one thing, the genes might cause allergic reactions in people who never had a reaction to that food before.

单选题American justice works on the ______ that an accused person is innocent until they are proved guilty.