单选题The coastal area has very mild winter, but the central plains remain extremely cold.

单选题How to Determine a Topic for Research Because you are going to put a lot of your time and energy into your research project(项目) ,the topic is especially important. In many instances your instructor may give a specific(特殊的)topic. I[ this is done, you have little choice, but most instructors will permit or even welcome a slightly changed focus(中心)in a topic if it is supported by good thinking. In some of your classes, the instructor may present a suggested list of several topics from which you are to make a choice. If this is done, do not simply select the first idea that attracts your attention. It may be one with which you will soon become bored, or it may be one on which you would have difficulty finding all the necessary information. Looking at the topics, try to consider how you might go about developing each of them. When you find out what seems especially interesting and worthwhile(值行骄傲的), do a bit checking in the library to see if you can get the basic resources you will need. Choosing a good research topic does not necessarily mean finding something that has a lot written about it. Many times you will have to research around a topic in order to find out the most useful information. Exciting and original topics often come to mind by combining two completely different interests. Let us say that you are interested in child psychology (心理学的)and in sports. Perhaps you can combine these into a study of the effect that is watching(可得到的)on the subject, you can research the topic individually and, by putting your information together, then draw a conclusion.

单选题The colors in these artificial flowers are sure not to vanish。A. disappearB. appearC. figureD. blend

单选题{{B}}第三篇{{/B}} {{B}} Human Space Exploration{{/B}} While scientists are searching the cause of the Columbia disaster, NASA is moving ahead with plans to develop a new craft that would replace shuttles (航天飞机) on space station missions by 2012 and respond quickly to space station emergencies. The space agency released the first set of mission needs and requirements several days ago for the orbital space plane (轨道航天飞机), which would be designed to transport a crew of four to and from the International Space Station. Although it includes few specifics, the plan states the orbiter (轨道航天飞机) will be safer, cheaper and require less preparation time than the shuttle. It would be able to transport four crew members by 2012--though it would be available for rescue missions by 2010. NASA says the craft should be able to transport injured or ill space station crew members to "definitive (决定性的) medical care" within 24 hours. The release of the requirements showed NASA remains focused on the long-term priorities of space exploration, even as questions exist concerning the loss of Columbia and its seven-member crew on February 1, 2003. Experts at Marshall Space Flight Center in Huntsville, Alabama, have been working for years on a successor to the shuttle. The project, known as the Space Launch Initiative (提案), was divided last year into two parts--one focusing on a future launch vehicle, the other on a space station orbiter. The orbiter is expected to be ready sooner. The program's managers say NASA officials have told them not to alter Space Launch Initiative in light of the Columbia disaster. U.S. President George W. Bush asked Congress for about US $1 billion for Space Launch Initiative in 2004, funds that would be almost equally split between the Orbital Space Plane and Next Generation Launch Technology.

单选题Foreign military aid was prolonging the war.

单选题John is Ucollaborating/U with Mary in writing an article.

单选题My father is a physician .

单选题According to the passage，the 1 billion funds，if granted，would

单选题The American Industry A history of long and effortless success can be a dreadful handicap, but if properly handled, it may become a driving force. When the United States entered just such a glowing period after the end of the Second World War, it had a market eight times larger than any competitor, giving its industries unparalleled economies of scale. Its scientists were the world's best, its workers the most skilled. America and Americans were prosperous beyond the dreams of the Europeans and Asians whose economies the war had destroyed. It was inevitable that this primacy should have narrowed as other countries grew richer. Just as inevitably, the retreat from predominance proved painful. By the mid-1980s Americans had found themselves at a loss over their fading industrial competitiveness. Some huge American industries, such as consumer electronics, had shrunk or vanished in the face of foreign competition. By 1987 there was only one American television maker left, Zenith. (Now there is none: Zenith was bought by South Korea's LG Electronics in July.) Foreign-made cars and textiles were sweeping into the domestic market America's machine-tool industry was on the ropes. For a while it looked as though the making of semiconductors, which America had which sat at the heart of the new computer age, was going to be the next casualty. All of this caused a crisis of confidence. Americans stopped taking prosperity for granted. They began to believe that their way of doing business was failing, and that their incomes would therefore shortly begin to fall as well. The mid-1980s brought one inquiry after another into the causes of America's industrial decline. Their sometimes sensational findings were filled with warnings about the growing competition from overseas. How things have changed! In 1995 the United States can look back on five years of solid growth while Japan has been struggling. Few Americans attribute this solely to such obvious causes as a devalued dollar or the turning of the business cycle. Self-doubt has yielded to blind pride. "American industry" has changed its structure, has gone on a diet, has learnt to be more quick-witted," according to Richard Cavanagh, executive dean of Harvard's Kennedy School of Government, "It makes me proud to be an American just to see how our businesses are improving their productivity, " says Stephen Moore of the Cato Institute, a think-tank in Washington, DC. And William Sahlman of the Harvard Business School believes that people will look back on this period as "a golden age of business management in the United States./

单选题The subject of this passage is the _______.

单选题A panel of prominent marine mammalogists will be Uassembled/U to study Keiko's behavior.

单选题Superconductor Ceramic (陶瓷) An underground revolution begins this winter. With the flip (轻击) of a switch,30,000 homes in one part of Detroit will soon become the first in the country to receive electricity transmitted by ice-cold high-performance cables. Other American cities are expected to follow Detroit"s example in the years ahead, which could conserve enormous amounts of power. The new electrical cables at the Frisbie power station in Detroit are revolutionary because they are made of superconductors. A superconductor is a material that transmits electricity with little or no resistance. Resistance is the degree to which a substance resists electric current. All common electrical conductors have a certain amount of electrical resistance. They convert at least some of the electrical energy passing through them into waste heat. Superconductors don"t. No one understands how superconductivity works. It just does. Making superconductors isn"t easy. A superconductor material has to be cooled to an extremely low temperature to lose its resistance. The first superconductors, made more than 50 years ago, had to be cooled to -263 degrees Celsius before they lost their resistance. Newer superconducting materials lose their resistance at -143 degrees Celsius. The superconductors cable installed at the Frisbie station is made of a ceramic material that contains copper, oxygen, bismuth (铋), strontium (锶), and calcium (钙). A ceramic is a hard, strong compound made from clay or minerals. The superconducting ceramic has been fashioned into a tape that is wrapped lengthwise around a long tube filled with liquid nitrogen. Liquid nitrogen is super cold and lowers the temperature of the ceramic tape to the point where it conveys electricity with zero resistance. The United States loses an enormous amount of electricity each year to resistance. Because cooled superconductors have no resistance, they waste much less power, other cities are watching the Frisbie experiment in the hope that they might switch to superconducting cable and conserve power, too.

单选题I don't get into a panic speaking the language when I'm in Greece, it's driving on the other side of the road which bothers me. A. anxiety B. objection to C. trouble in D. dismay

单选题Techniques to {{U}}employ{{/U}} the energy of the sun are being developed. A.convert B.store C.use D.receive

单选题American Society When foreigners are sometimes asked what seems most strange about American society, somewhere on the top of the list will be the fact the average citizen is allowed to possess guns. Although it is true that many people carry guns legally in the United States, it is also known that many who possess guns carry illegally. Others, who don't have guns, feel that guns can be acquired quite easily. A recent survey indicated that many high school students, especially in the inner cities, can acquire gun with little difficulty. Although most people would never want to own a gun, others have taken up hunting as a sport and enjoy hunting wild game in season. Hunting for deer and duck in fall and winter is very much a part of the American culture. Also, some farmers in rural areas who raise cattle and sheep feel they need to protect their animals against wolves that attack their herds and flocks at night. To defend and support their rights to possess firearms the National Rifle Association (NRA) was founded in 1871. The main importance of this organization has been its efforts to prevent strict gun control legislation. The NRA has great political support in small towns and rural areas, especially in the West and the South, where hunting is especially popular. Those who favor the right to possess guns insist that the Constitution provides the right of people "to keep and bear arms". They believe that gun control laws will not solve the problem of crime and violence in America. Recent events in America, however, have shown that the question of gun possession is now out of control and strong voices have called for immediate action to be taken. In seemingly peaceful schools students have gone into classrooms and opened fire upon their classmates. America has been shocked by such incidents which seem to occur with greater frequency. The periodic deaths of innocent citizens and even foreign visitors from guns have forced legislators to pass laws to stop these senseless killings. The day may not be far off when America will be transformed from a gun culture to one which controls their use and possession.

单选题This gold mine was discovered {{U}}by accident{{/U}}.

单选题 阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子做出判断。如果该句提供的是正确信息，请选A；如果该句提供的是错误信息，请选 B；如果该句的信息文章中没有提及，请选C。 {{B}} A Dolphin and an Astronomer{{/B}} One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visiting an institute which was looking into the way dolphins communicate with each other. Sagan was standing on the edge of one of the tanks where several of these friendly, highly intelligent creatures were kept. Elvar had just swum up alongside him and had turned on his back. The dolphin wanted Sagan to scratch his. stomach again, as the astronomer had done twice before. Elvar looked up at Sagan, waiting. Then, after a minute or so, the dolphin leapt up through the water and made a sound just like the word "more". The astonished astronomer went to the director of the institute and told him about the incident. "Oh, yes. That's one of the words he knows," the director said, showing no surprise at all. Dolphins have bigger brains in proportion to their body size than humans have, and it has been known for a long time that they can make a number of sounds, What is more, these sounds seem to have different functions, such as warning each other of danger. Sound travels much faster and much further in water than it does in air, That is why the parts of the brain that deal with sound are much better developed in dolphins than in humans. But can it be said that dolphins have a "language", in the real sense of the word? Scientists don't agree on this. A language is not just a collection of sounds, or even words. A language has a structure and what we call a grammar. The structure and grammar of a language help to give it meaning. For example, the two questions "Who loves Mary?" and "Who does Mary love?" mean very different things. If you stop to think about it, you will see that this difference doesn't come from the words in the question but from the difference in structure. That is why the question "Can dolphins speak?" can't be answered until we find out if dolphins not only make sounds but also arrange them in a grammatical order which affects their meaning.

单选题The tomato juice left a brown stain on the front of my jacket.

单选题An old friend called on me the day before yesterday.

单选题In Tom's eyes, the restaurant at the comer of the street is a very smart one.A. cleverB. elegantC. loyalD. brave