单选题The car one drives may show his/her ______ or social position. A. curiosity B. status C. importance D. reputation

单选题In deciding to undertake dangerous pursuits, people A usually strive for their maximum personal ability rating, B when they C are challenged but can be victorious, rather than merely D surmounting the mediocre .

单选题In their world of darkness, it would seem likely that some of the animals might have become blind, as has happened to some cave fauna. So, indeed, many of them have, compensating for the lack of eyes with marvelously developed feelers and long, slender fins and processes with which they grope their way, like so many blind men with canes, their whole knowledge of friends, enemies, or food coming to them through the sense of touch. The last traces of plant life are left behind in the thin upper layer of water for no plant can live below about 600 feet even in very clear water, and few find enough sunlight for their food-manufacturing activities below 200 feet. Since no animal can make its own food, the creatures of the deeper waters live a strange, almost parasitic existence of utter dependence on the upper layers. These hungry carnivores prey fiercely and relentlessly upon each other, yet the whole community is ultimately dependent upon the slow rain of descending food particles from above. The components of this never-ending rain are the dead and dying plants and animals from the surface, or from one of the intermediate layers. For each of the horizontal zones or communities of the sea that lie between the surface and the sea bottom, the food supply is different and in general poorer than for the layer above. Pressure, darkness, and silence are the conditions of life in the deep sea. But we know now that the conception of the sea as a silent place is wholly false. Wide experience with hydrophones and other listening devices for the detection of submarines has proved that, around the shore lines of much of the world, there is the extraordinary uproar produced by fishes, shrimps, porpoises and probably other forms not yet identified. There has been little investigation as yet of sound in the deep, offshore areas, but when the crew of the Atlantis lowered a hydrophone into deep water off Bermuda, they recorded strange mewing sounds, shrieks, and ghostly moans, the sources of which have not been traced. But fish of shallower zones have been captured and confined in aquaria, where their voices have been recorded for comparison with sounds heard at sea, and in many cases satisfactory identification can be made. During the Second World War the hydrophone network set up by the United States Navy to protect the entrance to Chesapeake Bay was temporarily made useless when, in the spring of 1942, the speakers at the surface began to give forth, every evening, a sound described as being like "a pneumatic drill tearing up pavement". The extraneous noises that came over the hydrophones completely masked the sounds of the passage of ships. Eventually it was discovered that the sounds were the voices of fish known as croakers, which in the spring move into Chesapeake Bay from the offshore wintering grounds. As soon as the noise had been identified and analyzed, it was possible to screen it out with an electric filter, so that once more only the sounds of ships came thorugh the speakers.

单选题I don't understand why people______such a beautiful garden with cans and bot- tles. A. located B. provided C. protected D. littered

单选题{{B}}Passage Five{{/B}} More than a year has passed since the space shuttle Columbia broke into pieces over central Texas. This past January President Bush announced a long-term program of space exploration that would return human beings to the Moon, and thereafter send them to Mars and beyond. As this magazine (Natural History) goes to press, the twin Mars Exploration Rovers, Spirit and Opportunity, are wowing the scientists and engineers at the rovers' birthplace--NASA's Jet Propulsion Laboratory (JPL)--with their skills as robotic field geologists. JPL's official rover Web site is being stampeded by visitors. The confluence of these and other events resurrects a perennial debate: with two shuttle failures out of 112 missions, and the astronomical expense of the manned space program, can sending people into space be justified, or should robots do the job alone? Modern societies have been sending robots into space since 1957, and people since 1961. Fact is, it's vastly cheaper to send robots: in most cases, a fiftieth the cost of sending people. Robots don't much care how hot or cold space gets; give them the fight lubricants, and they'll operate in a vast range of temperatures. They don't need elaborate life-support systems, either. Robots can spend long periods of time moving around and among the planets, more or less unfazed by ionizing radiation. They do not lose bone mass from prolonged exposure to weightlessness, because, of course, they are boneless. You don't even have to feed them. Best of all, once they've finished their jobs, they won't complain if you don't bring them home. But there's a flip side to this argument. Back in the late 1960s and early 1970s, in the days of NASA's manned Apollo flights to the Moon, no robot could decide which pebbles to pick up and bring home. But when the Apollo 17 astronaut Harrison Schmitt, the only geologist to have walked on the Moon, noticed some odd, orange and black soil on the lunar surface, he immediately collected a sample. It turned out to be minute beads of volcanic glass. Today a robot can perform staggering chemical analyses and transmit amazingly detailed images, but it still can't react, as Schmitt did, to a surprise. By contrast, packed inside the 150-pound mechanism of a field geologist are the capacities to walk, run, dig, hammer, see, communicate, interpret, and invent. And of course when something goes wrong, an on-the-spot human being becomes a robot's best friend. After landing on Mars this past January 3, did the Spirit rover just roll right off its lander platform and start checking out the neighborhood? No, its air-bags were blocking the path. Not until January 15 did Spirit's remote controllers man-age to get all six of its wheels rolling on Martian soil. Anyone on the scene on January 3 could have just lifted the airbags out of the way and given Spirit a little shove.

单选题{{B}}Passage 2{{/B}} With increasing prosperity, West European youth is having a fling that is creating distinctive consumer and cultural patterns. The result has been the increasing emergence in Europe of that phenomenon well known in America as the "youth market." This is a market in which enterprising businesses cater to the demands of teenagers and older youths in all their beatlemania and pop-art forms. In the United States, the market is wide-ranging and well established, almost an industry, which with this country's emphasis on "youthfulness," even extends beyond teenager groups. As in the United States, youthful tastes in Europe extend over a similar range of products-records and record players, leather jackets and "wayout," extravagantly styled clothing, cosmetics and soft drinks. Generally it now is difficult to tell in which direction trans-Atlantic teenage influences are flowing. Also, a pattern of conformity dominates European youth as in this country, though in Britain the object is to wear clothes that "make the wearer stand out," but also make him "in," such as tight trousers and precisely tailored jackets. Worship and emulation of "idols" in the entertainment field, especially the "pop" singers and other performers, can be viewed as another similarity. There is also the same exuberance and unpredictability in sudden fad switches. In Paris, buyers of stores catering to the youth market carefully watch what dress is being worn by a popular television teenager singer to be ready for a sudden demand for copies. In Stockholm other followers of teenage fads call the youth market "attractive bat irrational." Actually, the scope and nature of the youth market varies considerably from country to country, being large and lively in some and only beginning to show itself in others. But there are also these important dissimilarities generally with the American youth-market: In the European youth-market, unlike that of the United States, it is the working youth who provides the bulk of purchasing power. On the average, the school-finishing age still tends to be 14 years. This is the maximum age to which compulsory education extend, and with Europe's industrial manpower shortage, thousands of teenage youths may soon attain incomes equal in many cases to that of their fathers. Although, because of general prosperity, European youths are beginning to continue school studies beyond the compulsory maximum age, they do not receive anything like the pocket-money or "allowances" of American teenagers. Working youth, consequently, are the big spenders in the European youth market, but they also have less leisure than those staying on at school, but these in turn have less buying power.

单选题The bus moved slowly in the thick fog. We arrived al our______ almost two hours later.(2003年上海交通大学考博试题)

单选题{{B}}Passage Two{{/B}} There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of governmental units (state and statistics come from the same Latin root, status) and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance. The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating, .ordering, and the taking of censuses - all of which led to modern descriptive statistics. From the influence of the father came modern inferential statistics, which is based squarely on theories of probability. Descriptive statistics involves tabulating, depicting, and describing collections of data. These data may be either quantitative, such as measures of height, intelligence, or grade level variables, that are characterized by an underlying continuum or the data may represent qualitative variable, such as sex, college major, or personality type. Large masses of data must generally undergo a process of summarization or reduction before they are comprehensible. Descriptive statistics is tool for describing or summarizing or reducing to comprehensible form the properties of an otherwise unwieldy mass of data. Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human mind. This general class of problems characteristically involves attempts to make predictions using a sample of observations. For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient to question each child; the proportion for the entire district could be estimated fairly accurately from a sample of as few as 100 children. Thus, the purpose of inferential statistics is to predict or estimate characteristics of a population from knowledge of the characteristics of only a sample of the population.

单选题In his ______ to further his knowledge of the universe, man has now begun to explore space. A. attempt B. expedition C. trial D. chase

单选题The earthquake that occurred in India this year was a major calamity in which a great many lives were lost.

单选题In the author's opinion, the reason for people's discontent about their health condition consists in______.

单选题Great works are performed not by strength but by persistence.

单选题I disapprove of diets so strongly because I think it's wrong suddenly to ______ your body of certain foods.

单选题______ mother-to-be Cherie Blair stunned the party by wearing a sensational violet silk trouser suit which she had specially made for the big night. A. Radial B. Radiant C. Radical D. Racial

单选题Anthropologists, psychologists and others have begun seeking the roots of ambition in family, culture, gender, genes and more. They have by no means thrown the curtain all the way back, but they have begun to part it. If humans are an ambitious species, it's clear we're not the only one. Many animals are known to signal their ambitious tendencies almost from birth. Even before wolf pups are weaned, they begin sorting themselves out into alphas and all the others. The alphas are quicker, more curious, greedier for space, milk, Mom--and they stay that way for life. Alpha wolves wander widely, breed annually and may live to a geriatric 10 or 11 years old. Lower-ranking wolves enjoy none of these benefits--staying close to home, breeding rarely and usually dying before they're four. Humans often report the same kind of temperamental determinism. Families are full of stories of the inexhaustible infant who grew up to be an entrepreneur, the phlegmatic child who never really showed much go. But if it's genes that run the show, what explains identical twins--precise genetic templates of each other who ought to be temperamentally identical but often exhibit profound differences in the octane of their ambition? Ongoing studies of identical twins have measured achievement motivation--lab language for ambition--in identical siblings separated at birth, and found that each twin's profile overlaps 30% to 50% of the other's. In genetic terms, that's an awful lot--"a benchmark for heritability", says geneticist Dean Hamer of the U.S. National Cancer Institute. But that still leaves a great deal that can be determined by experiences in infancy, subsequent upbringing and countless other imponderables. Some of those variables may be found by studying the function of the brain. At Washington University in St. Louis, Missouri, researchers have been conducting brain imaging to investigate a trait they call persistence--the ability to stay focused on a task until it's completed just so--which they consider one of the critical engines driving ambition. The researchers recruited a sample group of students and gave each a questionnaire designed to measure persistence level. Then they presented the students with a task--identifying sets of pictures as either pleasant or unpleasant and taken either indoors or outdoors--while conducting magnetic resonance imaging of their brains. The nature of the task was unimportant, but how strongly the subjects felt about performing it well--and where in the brain that feeling was processed--could say a lot. In general, the researchers found that students who scored highest in persistence had the greatest activity in the limbic region, the area of the brain related to emotions and habits. "The correlation was .8 [or 80%]," says professor of psychiatry Robert Cloninger, one of the investigators. "That's as good as you can get." It's impossible to say whether innate differences in the brain were driving the ambitious behavior or whether learned behavior was causing the limbic to light up. But a number of researchers believe it's possible for the nonambitious to jump-start their drive, provided the right jolt comes along. "Energy level may be genetic," says psychologist Simonton, "but a lot of times it's just finding the right thing to be ambitious about." Simonton and others often cite the case of Franklin D. Roosevelt, who might not have been the same President he became--or even become president at all--had his disabling polio not taught him valuable lessons about patience and tenacity.

单选题If you want to get into that tunnel, you have to ______ away all the rocks.

单选题In view of obstruction and Udisappointment/U, the prime minister decided to make parliamentary alliance.