单选题If a person's eye has been looking at an object in bright sunlight for some time, and then shifts to an object not well lit, we can expect ______.

单选题During her two-week stay in Beijing, Elizabeth never ______ a chrome(chance) to practice her Chinese.

单选题 Man has long wished to predict earthquakes. Recent findings indicate that reliable earthquake prediction is almost a reality. Before earthquakes occur, there frequently are changes in rock behavior that affect the velocities of other earthquake waves passing through the rocks. The former Soviet seismologists have used earthquake waves from other unrelated earthquakes to meas- ure the alterations in wave speed through rocks around a fault zone. For months to years before a particular earthquake, the former Soviet scientists observed that the strained rock in the fault zone was deformed in a way that slowed other earthquake wave that passed through the zone. Similar behavior has preceded earthquakes in California and New York. Changes in electrical resistance, water pressure l rock motion, and leakage of gas also can accompany the lowering of wave velocity. Fractures in the fault zone apparently open, which leads to a lowering of water pressure. When the fractures are filled by underground water, the continuing stress on the rocks is also exerted on the water in pores, which contributes to pressure within the rocks and ultimately causes further fault movement and earthquakes. These preliminary events have been observed and studied for many earthquakes. The larger the earthquake, apparently the longer the time during which the preliminary events take place. Careful observation and measurement of the early events will precede reliable forecasts. The preliminary events are most evident along normal and reverse fault systems, and strike-slip faults may not produce the same effect. Although earthquake forecasting is in its infancy, both American and the former Soviet scientists have been able to predict the occurrence of a few earthquakes. Understanding of the causes of earthquakes has opened several possibilities for their control. Underground nuclear explosions in Nevada have released strain energy stored in certain rocks. In some instances, the shock wave from the explosion has raised the strain on nearby fractures and faults enough to initiate fault movement. All of the resulting earthquakes have been small, but a large earthquake could conceivably be initiated. In the future, a situation may arise where it is desirable to deliberately initiate an earthquake near a heavily populated area because too large an amount of strain has accumulated on an active fault zone in the vicinity. If hazardous areas were left empty and if emergency services were standing at the ready, such action might be considered necessary to prevent a later much more damaging earthquake. However, the legal, environmental, and human problems would be large in- deed, perhaps too great for such action to be taken. Another possibility for earthquake control is much more exciting. Increasing water pressures can initiate faulting, as was unintentionally demonstrated by a deep well at the U. S. Army' s Rock Mountain Arsenal near Denver, Colorado, in the early 1960s. Disposal of nerve gas wastes in the well triggered movement along deeply buried inactive faults in the region. The liquid waste reduced frictional resistance along fault flat surface in the rocks surrounding the well, leading to movement along the faults. Earthquake activity in the area connected closely with the times of pumping of wastes into the disposal well, as was demonstrated convincingly by a Denver geologist, David Evans. Strain energy stored along the fault flat surface was apparently released by the fluid injection. Experiments by the U. S. Geological Survey in the Rangely oil field of northwestern Colorado have added to the experience gained from the study of the Denver earthquakes. The Survey geologists injected water in some of the Rangely wells, causing very small earthquakes. By withdrawing the water, the earthquakes were stopped. Although it is premature, many geologists believe we could eventually restrain earthquakes by injecting fluid into fault zones to permit slippage to take place gradually or in a series of small earthquakes. However, means must be found to control the areas affected and to be certain a major destructive quake is not initiated.

单选题I'd ______ his reputation with other farmers and business people in the community, and then make a decision about whether or not to approve a loan. A. take into account B. account for C. make up for D. make out

单选题The chief functions of direct-mail advertising are to familiarize prospective buyers with a product, its name, its maker, and its merits and with the product's local distributors.

单选题The sentence given to the criminal was much too ______;murder should carry the maximum penalty. A. negligent B. solitary C. lenient D. tedious

单选题According to the passage, those who live in a traditional fanfily ______.

单选题And the topic "fat" is forbidden. Even tile slightest paunch betrays that one is los ing the trim and______of youth.

单选题In the society described in the passage, the legal standing of the wife marriage was ______.

单选题In ancient times, some catastrophic extinction of species occurred ______, but such catastrophes were comparatively rare.

单选题The study of philosophies should make our own ideas flexible. We are all of us apt to take certain general ideas for granted, and call them common sense. We should learn that other people have held quite different ideas, and that our own have started as very original guesses of philosophers. A scientist is apt to think that all the problems of philosophy will ultimately be solved by science. I think this is true for a great many of the questions on which philosophers still argue. For example, Plato thought that when we saw something, one ray of light came to it from the sun, and another from our eyes and that seeing was something like feeling with a stick. We now know that the light comes from the sun, and is reflected into our eyes. We don't know in much detail how the changes in our eyes give rise to sensation. But there is every reason to think that as we learn more about the physiology of the brain, we shall do so, and that the great philosophical problems about knowledge are going to be pretty fully cleared up. But if our descendants know the answers to these questions and others that perplex us today, there will still be one field of which they do not know, namely the future. However exact our science; we cannot know it as we know the past. Philosophy may be described as argument about things of which we are ignorant. And where science gives us a hope of knowledge it is often reasonable to suspend judgment. That is one reason why Marx and Engels quite rightly wrote to many philosophical problems that interested their contemporaries. But we have got to prepare for the future, and we cannot do so rationally without some philosophy. Some people say we have only got to do the duties revealed in the past and laid down by religion, and god will look after the future. Others say that the world is a machine and the course of future events is certain, whatever efforts we may make. Marxists say that the future depends on ourselves, even though we are part of the historical process. This philosophical view certainly does inspire people to wry great achievements. Whether it is true or not, it is powerful guide to action. We need a philosophy, then, to help us to tackle the future. Agnosticism easily becomes an excuse for laziness and conservatism. Whether we adopt Marxism or any other philosophy, we cannot understand it without knowing something of how it developed. That is why knowledge of the history of philosophy is important to Marxists, even during the present critical days.

单选题This amazing woman was born a poor German princess and became one of Russia"s greatest emperors. She was born Princess Sophia August Frederika on May 2, 1729, in the Baltic seaport town of Stettin, then a part of German Pomerania. Her father was an obscure German military prince named Christian August, and her mother was Princess Joanna Elizabeth of Holstein-Gottorp. Her father was. ruler of the tiny principality of Anhalt-Zerbst, but the greater part of his life was spent as an officer in the service of Prussia. In 1744, she arrived in Moscow with her mother to marry Peter, the Grand Duke of Holstein, grandson of Peter the Great and heir to the Russian throne (later Peter Ⅲ). Their marriage was an unhappy one. Catherine (now baptized into the Russian Orthodox Church under that name) spent much of her time preparing for her future reign. In 1761, Peter was crowned emperor. Supported by the Russian military, Catherine overthrew Peter in 1762 and became Catherine II. She quickly began to make changes in government and society based on ideas learned from French-Philosophers of the Enlightenment and the authors of ancient Rome. She was a friend of Voltaire and other European writers, and wrote stories and plays. She supported French writer and philosopher Denis Diderot when he was broken-she bought his library, hired him to look after it at his own house, for which she paid him a salary for the next 50 years in advance. Catherine patronized the arts, music and education, and she put millions of rubles into the creation of the Hermitage Museum, which today is the delight of Russia and the world. No other Russian monarch appreciated beauty as much as Catherine. She set the stage for the emergence of a national Russian culture that would become something unique and wonderful in the 19th century. Catherine established the first schools for women, including the Smolny Institute for in Petersburg. Also, Russia"s first public schools and universities were founded during her reign. Her rule was one of the most prosperous periods of the Russian Empire. She undertook a wide range of internal political reforms, waged two successful wars against the Ottoman Empire and occupied vast territories on Russia"s southern boundaries, eventually advancing the country"s border to the Black Sea.

单选题It is well known that the popular singer has a/an______car in addition to a large house.

单选题Directions: There are four passages in the part. Each passage is followed by some questions or unfinished statements. For each of them, there are 4 choices marked A, B, C and D. Read the passages carefully and decide on the best choice. Passage 1 Unless we spend money to spot and prevent asteroids (小行星)now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星)that race across the night sky. Most orbit the sun far from Earth and don't threaten us. But there are also thousands whose orbits put them on a collision course with Earth. Buy $ 40 million worth of new telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we'll have a way to change its course. Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn't be cheap. Is it worth it? Two things experts consider when judging any risk are : 1) How likely the event is ; and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 400, 000 years. Sounds pretty rare-but if one did fall, it would be the end of the world. "If we don't take care of these big asteroids, they'll take care of us," says one scientist. "It's that simple. " The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? "The world has less to fear from doomsday (毁灭性的) rocks than from a great nuclear fleet set against them," said a New York Times article.

单选题Leadership A is all about getting people B consistent to give their best, helping them to grow to C their fullest potential , and motivating them to work toward a common goal. Leaders make the right things happen when they D are supposed to .

单选题If Debbie cannot manage family and work, she will ______.

单选题The City of London is the ______ of Britain's financial world.