试题库在线考试题库-历年真题模拟试题及答案-考博英语在线试题测试中心-希赛网

黑龙江大学

As a fashionable leisure activity, traveling is favored by a growing number of people. Due to the rapid development of economy, the improvement of living standard and the government’s support of tourism, traveling is becoming more and more popular in China. Traveling has gradually become an essential part of people’s daily life. On holidays, numerous Chinese tourists would swarm into scenic spots across the world. When traveling, people can broaden their horizons, enrich their knowledge and appreciate beautiful natural landscapes, which would eventually help to relax themselves physically and mentally.

One of the simplest and best known kinds of crystal is the ionic salt, of which a typical example is sodium chloride, or ordinary table salt. The fundamental components of an ionic salt are ions: atoms or molecules that have become electrically charged by gaining or losing one more electrons. In forming sodium chloride, for example, sodium atoms give up an electron (thereby becoming, positively charged) and chlorine atoms gain an electron (thereby becoming negatively changed). The ions are attracted to one another by their opposite charges, and they stack together compactly, like tightly packed spheres.Recently, scientists at Michigan State University created a new kind of crystal called an electride. In electrides, the anions (negative ions) are completely replaced by electrons, which are trapped in naturally formed cavities within a framework of regularly stacked cations (positive ions). Electrides are the first examples of ionic salts in which all these anionic sites are occupied solely by electrons.Unlike other types of anions, anionic electrons do not behave as if they were simple charged spheres. In particular, because of their low mass and their tendency to interact with one another over great distances, they cannot be “pinned down” to any one location. Instead, they wander close to and among the atoms lining the cavity and interact with electrons in nearby cavities, perhaps changing places with them.The properties of an electride depend largely on the distance between the cavities that hold trapped electrons. When the trapped electrons are far apart, they do not interact strongly, and so behave somewhat like an array of isolated negative charges. When they are closer together, they begin to display properties associated with large ensembles of identical particles. When they are still closer, the ensemble properties dominate and the electrons “delocalize”: they are no longer tightly bound within individual cavities but are more or less free to pass through the spaces within the framework of positive ions.By synthesizing electrides from a variety of materials, one can vary the geometry of the anionic cavities and their relation to the surrounding cations. The resulting properties may make it possible for electrides to become a basis for economically useful new materials and devices. For instance, because the electrons in some electrides are very weakly bound, these crystals could be effective as photosensitive detectors, in which an impinging photon liberates an electron, resulting in a small electric current. The same weak binding could also make electrides useful in solar energy converters and as cathodes in batteries. One obstacle is the tendency of electrides to decompose through reaction with air and water. Researchers are seeking ways to increase their stability.1. The passage is primarily concerned with discussing _____.2. In the first paragraph, the author is primarily concerned with ______.3. It can be inferred from the passage that the differences between the behavior of anionic electrons and normal anions result from which of the following features of electrons, as compared to normal anions?I. The much lower mass of electrons.II. The much greater tendency of electrons to interact with one another over large distances.III. The much greater likelihood of electrons to remain trapped in naturally formed anionic cavities.4. According to the passage, the defining characteristic of an electride is which of the following?5. It can be inferred from the passage that anions behaving as “simple charged spheres” (3rd paragraph) could be expected to ____.

The establishment of the Third Reich influenced events in American history by starting a chain of events which culminated in war between Germany and the United States. The compete destruction of democracy, the persecution of Jews, the war on religion, the cruelty and barbarism of the Nazis, and especially the plans of Germany and her allies, Italy and Japan, for world conquest caused great indignation in this country and brought on fear of another world war.While speaking out against Hitler’s atrocities, the American people generally favored isolationist policies and neutrality.The Neutrality Acts of 1935 and 1936 prohibited trade with any belligerents or loans to them. In 1937 the President was empowered to declare an arms embargo in wars between nations at his discretion.American opinion began to change somewhat after President Roosevelt’s “quarantine the aggressor” speech at Chicago (1937) in which he severely criticized Hitler’s policies. Germany’s seizure of Austria and the Munich Pact for the partition of Czechoslovakia (1938) also aroused the American people.The conquest of Czechoslovakia in March, 1939 was another rude awakening to the menace of the Third Reich. In August, 1939 came the shock of the Nazi-soviet Pact and in September the attack on Poland and the outbreak of European war.The United States attempted to maintain neutrality in spite of sympathy for the democracies arrayed against the Third Reich. The Neutrality Act of 1939 repealed the arms embargo and permitted “cash and carry” exports of arms to belligerent nations. A strong national defense program was begun.A draft act was passed (1940) to strengthen the military services. A Lend Act (1941) authorized the President to sell, exchange, or lend materials to any country deemed necessary by him for the defense of the United States. Help was given to Britain by exchanging certain overage destroyers for the right to establish American bases in British territory in the Western Hemisphere. In August, 1940 President Roosevelt and Prime Minister Churchill met and issued the Atlantic Charter which proclaimed the kind of a world which should be established after the war. In December, 1941, Japan launched the unprovoked attack on the United States at Pearl Harbor. Immediately thereafter, Germany declared war on the United States.1. One item occurring before 1937 that the author does not mention in his list of actions that alienated the American public was _____.2. The Lend-Lease Act was designed to _____.3. American policy during the years 1935-1936 may be described as being ______.4. The Neutrality Act of 1939 ______.5. We entered the war against Germany ________.

The Law to Keep the Oil Industry under ControlThe Norwegian Government is doing its best to keep the oil industry under control. A new law limits exploration to an area south of the southern end of the long coastline; production limits have been laid down (though these have already been raised); and oil companies have not been allowed to employ more than a limited number of foreign workers.But the oil industry has a way of getting over such problems, and few people believe that the government will be able to hold things back for long.As on Norwegian politician said last week “We will soon be changed beyond all recognition.” Ever since the war, the Government has been carrying out a programme of development in the area north of the Arctic Circle. During the past few years this programme has had a great deal of success: Tromso has been built up into a local capital with a university, a large hospital and a healthy industry. But the oil industry has already started to draw people south, and within a few years the whole northern policy could be in ruins.The effects of the oil industry would not be limited to the north, however. With nearly 100 percent employment, everyone can see a situation developing in which the service industries and the tourist industry will lose more of their workers to the oil industry. Some smaller industries might even disappear altogether when it becomes cheaper to buy goods from abroad.The real argument over oil is its threat to the Norwegian way of life. Farmers and fishermen do not make up most of the population, but they are an important part of it, because Norwegians see in them many of the qualities that they regard with pride as essentially Norwegian.And it is the farmers and the fishermen who are most critical of the oil industry because of the damage that it might cause to the countryside and to the sea.1. The Norwegian Government would prefer the oil industry to ______.2. The Norwegian Government has tried to ______.3. According to the passage, the oil industry might lead northern Norway to _____.4. In the south, one effect to the development of the oil industry might be ______.5. Norwegian farmers and fishermen have an important influence because ______.

From the health point of view we are living in a marvelous age. We are immunized from birth against many of the most dangerous diseases. A large number of once fatal illnesses can now be cured by modern drugs and surgery. It is almost certain that one day remedies will be found for the most stubborn remaining disease. The expectation of life has increased enormously. But though the possibility of living a long and happy life is greater than ever before, every day we witness the incredible slaughter of men, women and children on the roads. Man versus the motor-car! It is a never-ending battle which man is losing. Thousands of people the world over are killed or horribly killed each year and we are quietly sitting back and letting it happen.It has been rightly said that when a man is sitting behind a steering wheel, his car becomes the extension of his personality. There is no doubt that the motor-car often brings out a man’s very worst qualities. People who are normally quiet and pleasant may become unrecognizable when they are behind a steering wheel. They swear, they are ill-mannered and aggressive, willful as two-year-old and utterly selfish. All their hidden frustrations, disappointments and jealousies seem to be brought to the surface by the act of driving.The surprising thing is that the society smiles so gently on the motorist and seems to forgive his behavior. Everything is done for his convenience. Cities are allowed to become almost uninhabitable because of heavy traffic; towns are made ugly by huge car parks; the countryside is desecrated by road networks; and the mass annual slaughter becomes nothing more than a statistic, to be conveniently forgotten.It is high time a world code were created to reduce this senseless waste of human life. With regard to driving, the laws of some countries are notoriously lax and even the strictest are not strict enough. A code which was universally accepted could only have a dramatically beneficial effect on the accident rate. Here are a few examples of the things that might be done. The driving test should be standardized and made far difficult than it is; all the drivers should be made to take a test every three years or so; the age at which young people are, allowed to drive any vehicle should be raised to at least 21; all vehicles should be put through strict annual tests for safety. Even the smallest amount of alcohol in the blood can impair a person’s driving ability. Present drinking and driving laws (where they exist) should be made much stricter. Maximum and minimum speed limits should be imposed on all roads. Governments should lay down safety specification for manufacturers, as has been done in the USA. All advertising stressing power and performance should be banned. These measures may sound inordinately harsh. But surely nothing should be considered as too severe if it results in reducing the annual toll of human life. After all, the world is for human beings, not for motor-cars.1. The main idea of this passage is_______.2. What does the author think of society toward motorists?3. Why does the author say: “his car becomes the extension of his personality?”4. Which of the followings is NOT mentioned as a way against traffic accidents?5. The attitude of the author is_____.

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