单选题 The economy in the United States is heavily dependent on aluminum, a material widely used in the construction of buildings and in making such diverse things as cars, airplanes, and food containers. In 1979 Americans used over five million tons of new aluminum, and one and a half million tons of recycled aluminum. Some ninety percent of the bauxite (矾土) ore from which new aluminum is normally derived had to be imported, to meet the demand. Poorer ores are abundant in the United States, however, and researchers at Purdue University may recently have found a way to obtain aluminum magnetically from these. Although aluminum is not attracted by ordinary magnets, under special conditions it becomes temporarily "paramagnetic", or very weakly responsive to a magnetic field. This is achieved by immersing ore particles in water to which certain salts have been added and then filtering the ore through steel wool in the presence of a strong magnetic field. It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import.

单选题Of all the truths that this generation of Americans hold self-evident, few are more deeply embedded in the national psyche than the maxim "It pays to go to collage." Since the Gl Bill transformed higher education in the aftermath of W. W. II, a college diploma, once a birthright of the leisured few, has become a lodestone for the upwardly mobile, as integral to the American dream as the pursuit of happiness itself. The numbers tell the story: In 1950s, 43% of high-school graduates went on to pursue some form of higher education; at the same time, only 6% of Americans were college graduates. But by 1992, almost 2 to out of 3 secondary-school graduates were opting for higher education—and 21% of a much larger U.S. population had college diplomas. As Prof. Herbert London of New York University told a commencement audience last June: "The college experience has gone from a rite passage to a right of passage." However, as the class of 1993 is so painfully discovering, while a college diploma remains a requisite credential for ascending the economic ladder, it no longer guarantees the good life. Rarely since the end of the Great Depression has the job outlook for college graduates appeared so bleak: of the 1.1 million students who received their baccalaureate degrees last spring, fewer than 20% had lined up full-time employment by commencement. Indeed, an uncertain job market has precipitated a wave of economic fear and trembling among the young. "Many of my classmates are absolutely terrified," says one of the fortunate few who did manage to land a permanent position. "They wonder if they'll ever find a job." Some of this recession-induced anxiety will dissipate if a recovery finally begins to generate jobs at what economists consider a normal rate. But the sad fact is that for the foreseeable future, college graduates will be in considerable surplus, enabling employers to require a degree even for jobs for which a college education is really unnecessary. According to Kristina Shelley of the Bureau of Labor Statistics—who bases her estimate on a "moderate projection" of current trends—30 percent of college graduates entering the labor force between now and the year 2005 will be unemployed or will find employment in jobs for which they will be overqualified, joining what economists call the "educationally underutilized". Indeed, it may be quite a while—if ever—before those working temporarily as cocktail waitresses or taxi drivers will be able to pursue their primary career paths. Of course waiting on tables and bustling cab fares are respectable ways to earn a living. But they are not quite what so many young Americans—and their parents—had in mind as the end product of four expensive years in college.

单选题According to Paragraph 2 ______.

单选题In the author's eyes "intellectuals" are those who ______.

单选题A．他们在辩论中表现非常出色，我们很难不佩服他们。B．如果你想申请一份学生签证，你就必须填写1M2A表格，你可以在最近的提供签证服务的英国领事馆免费获得该表格。C. 医院内，在可能干扰设备使用的任何区域，禁止使用手机。D. 众所周知，我们的许多问题一一事实上是所有的问题，从代沟、高离婚率到某些精神疾病一一至少部分是由于没有能够交流思想引起的。

单选题Text 3 It's wonderful how everyone agrees (or fears to disagree) that genetic discrimination is a bad thing. Your genes are beyond your control. Why should you be punished for them? Unfortunately, genetic discrimination is universal, inevitable and, in some ways, essential. Leaving aside the hot issue of intelligence, consider clearly genetic traits such as musical or athletic talent. Practice, practice will get you to Carnegie Hall, but only if you're born on the right bus. The notion of not discriminating on the basis of inborn talent is not even an abstract ideal, the world would be a poorer place if it did not distinguish between me and Yo-Yo Ma in doling out opportunities to be a concert cellist. As we learn more about the human genome, we'll learn that more and more of the traits we reward have a genetic component. Martin Luther King said we should all be judged on "the content of our character." But if a disposition to hard work or courage or creative imagination turns out to have a large genetic component, should we still judge people based on these qualities? Then, too, the world discriminates on the basis of clearly genetic traits, such as physical beauty, that are irrelevant in most circumstances. Occasionally, some zealot proposes to ban this kind of discrimination, too. But it will never happen. So what is the limiting principle on banning genetic discrimination? Where do we stop? Right now, the universal consensus makes a distinction between the results of genetic tests and genetic traits that reveal themselves in some other way. It seems unfair and arbitrary that your fate in life should be determined in any important way by what a drop of your blood reveals under a microscope; but logically, there is no difference between this and letting your fate be determined by how tall or musically gifted you are. A Juilliard tryout is, in part, a genetic test. If there were a blood test for musical talent, as there may be some day, it would do the same thing more efficiently. A blood test might even be fairer than the crude substitutes we use instead to judge and choose among people: It would zero in on the trait we really need to discriminate about and reduce discrimination on the basis of traits that are irrelevant. Some people say the danger is that genetic testing will encourage irrelevant discrimination; employers will overreact and refuse to hire you even though your actual likelihood of getting Alzheimer's before your retirement is minuscule. But discriminationby mistake will often bring its own punishment, like any business misjudgment. The real problem is discrimination that makes perfect sense. A health insurer is not crazy or stupid to want to keep people out of its insurance pool if they're more likely to get sick. Nor is the company evil to do this if the law allows it. The idea of insurance is to protect against unpredictable costs. Ignoring predictable costs, when your competitors aren't required to do the same, is a recipe for bankruptcy.

单选题We met Mary and her husband at a party two months ago. ______we've had no further communication.

单选题They are busy ______ in their lessons before the exam.

单选题The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency. As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world's largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

单选题He was left alone in the room with______to look after him though he was only five years old.

单选题The salary range indicates that ______.

单选题The leaders of the two countries are planning their summit meeting with a {{U}}pledge{{/U}} to maintain and develop good ties.

单选题A. station B. question C. attention D. condition

单选题All the products mead in China are sold and distributed in______with the U.S. Export Administration Regulations and also local country rules. A. compliance B. prosperity C. merchandise D. intersection

单选题Shopping malls customarily experience some Uslack/U periods for sales, especially so in summer.

单选题Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that have undergone no significant genetic change. In analyzing the latter, scientists have discovered the importance of social and ecological factors to epidemics. Poliomyelitis, for example, emerged as an epidemic in the United States in the twentieth century, by then, modern sanitation was able to delay exposure to polio until adolescence or adulthood, at which time polio infection produced paralysis. Previously, infection had occurred during infancy, when it typically provided lifelong immunity without paralysis. Thus, the hygiene that helped prevent typhoid epidemics indirectly fostered a paralytic polio epidemic. Another example is Lyme disease, which is caused by bacteria that are transmitted by deer ticks. It occurred only sporadically during the late nineteenth century, but has recently become prevalent in parts of the United States, largely due to an increase in the deer population that occurred simultaneously with the growth of the suburbs and increased outdoor recreational activities in the deer's habitat. Similarly, an outbreak of dengue hemorrhagic fever became an epidemic in Asia in the 1950s because of ecological changes that caused Aedesaegypti, the mosquito that transmits the dengue virus, to proliferate. The stage is now set in the United States for a dengue epidemic because of the inadvertent introduction and wide dissemination of another mosquito, Aedesalbopictus.

单选题{{B}}Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose one best answer and blacken the corresponding letter on the Answer Sheet.{{/B}}{{B}}Passage One{{/B}} Suppose you have a brick and a sponge which are exactly the same size. The brick and the sponge will occupy the same amount of space, but they will not weigh the same. If two things are exactly the same size, but differ in weight, then they have different densities. The one with the greater weight for the same size has the greater density. The one with lower weight for the same size has the lower density. Now apply this idea to {{U}}fluids{{/U}}. You know that water and air expand when they are heated and therefore become less dense. If you poured a cupful of very hot water and let it cool, you would have a little less than a cupfull of cool water. If you weighed a cupful of very hot water and a cupful of cool water, the cupful of very hot water would weigh a little less. The cupful of cool water, being a little heavier than the cupful of hot water, would really have a little more water in it. Cold water is denser than hot water. Likewise, cold air is denser than hot. air. The greater weigh! of !he denser material makes it fall to the bottom of the container. It pushes up the less dense material.

单选题But for me, none of this matched the experience of simply meandering around Pingyao"s unheralded back streets.

单选题As Dr. Samuel Johnson said in a different era about ladies preaching the surprising thing about computers is not that they think less well than a man, but that they think at all. The early electronic computer did not have much going for it except a marvelous memory and some good math skills. But today the best models can be wired up to learn by experience, follow an argument, ask proper questions and write poetry and music. They can also carry on somewhat puzzling conversations. Computers imitate life. As computers get more complex, the imitation gets better. Finally, the line between the original and the copy becomes unclear. In another 15 years or so, we will see the computer as a new form of life. The opinion seems ridiculous because, for one thing, computers lack the drives and emotions of living creatures. But drives can be programmed into the computer's brain just as a new form of life. Computers match people in some roles, and when fast decisions are needed in a crisis, they often surpass them. Having evolved when the pace of life was slower, the human brain has an inherent defect that prevents it from absorbing several streams of information simultaneously and acting on them quickly. Throw too many things at the brain at one time and it freezes up. We are still in control, but the capabilities of computers are increasing at a fantastic rate, while raw human intelligence is changing slowly, if at all. Computer power has increased ten times every eight years since 1846. In the 1990s, when the sixth generation appears, the reasoning power of an intelligence built out of silicon will begin to match that of the human brain. That does not mean the evolution of intelligence has ended on the earth. Judging by the past, we can expect that a new species will arise out of man, surpassing his achievements as he has surpassed those of his predecessor. Only a carbon chemistry enthusiast would assume that the new species must be man's flesh-and-blood descendants. The new kind of intelligent life is more likely to be made of silicon.