单选题He does nothing that breaks the interests of the collective.A. runs forB. runs againstC. runs overD. runs into

单选题Your father is furious about the damage you have done to the flower beds.A. angryB. anxiousC. uncertainD. worried

单选题Prohibition in the United States ushered in an era of crime and corruption.

单选题下面的短文后列出了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，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 California Gives Green Light to Space Solar Power Energy beamed down from space is one step closer to reality，now that California has given the green light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts(兆瓦)of power beamed down from solar-power satellites beginning in 2016．But some major challenges will have to be overcome if the technology is to be used widely． A start-up company called Solaren is designing the satellites，which it says will use radio waves to beam energy down to a receiving station on Earth． The attraction of collecting solar power in space is the almost uninterrupted sunshine available in geosynchronous(与地球同步的)orbit．Earth-based solar ceils，by contrast，can only collect sunlight during daytime and when skies are clear． But space．based solar power must grapple(努力克服)with the high cost per kilogram of launching things into space，says Richard Schwartz of Purdue University in West Lafayette，Indiana．“If you're talking about it being economically viable for power of the Earth，it's a tough go，”he says． Cal Boerman，Solaren's director of energy services，says the company designed its satellites with a view to keeping launch costs down．“We knew we had to come up with a different，revolutionary design，” he says．A patent the company has won describes ways to reduce the system's weight，including using inflatable mirrors to focus sunlight on solar cells，so a smaller number can collect the same amount of energy． But using mirrors introduces other challenges，including keeping the solar cells from overheating，says Schwartz．“You have to take care of heat dissipation(散发)because you're now concentrating a lot of energy in one place，”he says．According to the company's patent，Solaren's solar cells will be connected to radiators to help keep them cool． Though Boerman says the company believes it can make space-based solar power work，it is not expecting to crowd out other forms of renewable energy．Laws in California and other states require increasing use of renewable energy in coming years，he points out．“To meet those needs，we're going to need all types of renewable energy sources，”he says．

单选题The word "period" in Paragraph 3 means the length of time

单选题These pictures will show you ______ our village look like.A. howB. whatC. whenD. that

单选题This is not typical of English, but is a feature of the Chinese language.

单选题 Microelectronics Revolution The 1980s are likely to be considered as a more than somewhat interesting decade for the United Kingdom and indeed for other industrialized countries. The political, social and economic autonomic reflexes in operation for the greater part of this century will have to give way to the new as conditions change. Paramount amongst these changes is the advent of microelectronics with their ability to increase productivity and the end of cheap, easily manipulated sources of energy. Together these will undoubtedly change the pattern of industrialization and industrialized life in a radical manner not seen in the UK since the early 19th century. Most technological changes are somewhat less than fundamental. Many act on an individual process of industry and so their effects on the general economy can be boxed off. Others act on the demand side with new products, often for new markets. Microelectronics, though, are different. It is difficult to think of parts of the economy on which they will not have an impact; it is especially very difficult to think of the many new consumer products that will evolve. It is already being used, in productive processes through robotics, in production planning through cheap computers, as cheap and easy to maintain components, and through telecommunications, teletext systems and word processing to provide, transmit and store information. The resulting large increases in productivity will mean that increased levels of output will be produced using fewer resources of manpower, raw materials and energy. On the face of it this has to be a good thing, it opens vistas that were previously closed. The cost, however, is measured in terms of the resulting job losses, job changes and lack of new jobs. If we sit back and allow the market to work allocating wealth and jobs-in other words-continue as we are at present, either the technologies will not be introduced at all or there will be social confrontation on a massive scale. This new technology improves productivity at precisely the time world trade growth is declining, and this is likely to diminish even further given the responses to the shortage of energy sources. This will almost certainly mean that our ability to supply will outstrip (超过) our ability to demand, giving a classic high unemployment.

单选题Plants in Desert Only special plants can survive the terrible climate of a desert, for these are regions where the annual range of the soil temperature can be over 75℃. Furthermore, during the summer there are few clouds in the sky to protect plants from the sun"s ray. Another problem is the fact that there are frequently strong winds that drive small, sharp particles of sand into the plants, tearing and damaging them. The most difficult problem for all forms of plant life, however, is the fact that the entire annual rainfall occurs during a few days or weeks in spring. Grasses and flowers in desert survive from one year to the next by existing through the long, hot, dry season in the form of seeds. These seeds remain inactive unless the right amount of rain falls. If no rain falls, or if insufficient rain falls, they wait until the next year, or even still the next. Another factor that helps these plants to survive is the fact that their life cycles are short. By the time the water from the spring rains disappears—just a few weeks after it falls—such plants no longer need any. The perennials (多年生植物) have special features that enable them to survive as plants for several years. Thus, nearly all desert perennials have extensive root systems below ground and a small shoot system above ground. The large root network enables the plant to absorb as much water as possible in short time. The small shoot system, on the other hand, considerably limits water loss by evaporation (蒸发). Another feature of many perennials is that after the rainy season they lose their leaves in preparation for the long, dry season, just as trees in wetter climates lose theirs in preparation for the winter. This reduces their water loss by evaporation during the dry season. Then, in next rainy season, they come fully alive once more, and grow new branches, leaves and flowers, just as the grasses and flowers in desert do.

单选题Sustainable Development of Agriculture Sustainable development is applied to just about everything from energy to clean water and economic growth, and as a result it has become difficult to question either the basic assumptions behind it or the way the concept is put to use. This is especially true in agriculture, where sustainable development is often taken as the sole measure of progress without a proper appreciation of historical and cultural perspectives. To start with, it is important to remember that the nature of agriculture has changed markedly throughout history, and will continue to do so. Medieval agriculture in northern Europe fed, clothed and sheltered a predominantly rural society with a much lower population density than it is today. It had minimal effect on biodiversity, and any pollution it caused was typically localized. In terms of energy use and the nutrients(营养成分) captured in the product it was relatively inefficient. Contrast this with farming since the start of the industrial revolution. Competition from overseas led farmers to specialize and increase yields. Throughout this period food became cheaper, safer and more reliable. However, these changes have also led to habitat (栖息地)loss and to diminishing biodiversity. What's more, demand for animal products in developing countries is growing so fast that meeting it will require an extra 300 million tons of grain a year by 2050. Yet the growth of cities and industry is reducing the amount of water available for agriculture in many regions. All this means that agriculture in the 21s tcentury will have to be very different from how it was in the 20th. This will require radical thinking. For example, we need to move away from the idea that traditional practices are inevitably more sustainable than new ones. We also need to abandon the notion that agriculture can be "zero impact". The key will be to abandon the rather simple and static measures of sustainability, which centre on the need to maintain production without increasing damage. Instead we need a more dynamic interpretation, one that looks at the pros and cons (正反两方面) of all the various way land is used. There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purity, carbon footprint and biodiversity. It is clear, for example, that the carbon of transporting tomatoes from Spain to the UK is less than that of producing them in the UK with additional heating and lighting. But we do not know whether lower carbon footprints will always be better for biodiversity. What is crucial is recognizing that sustainable agriculture is not just about sustainable food production.

单选题Which of the following can best reflect the theme of the passage?

单选题The economy continued to exhibit signs of decline in September.

单选题The Greatest Mystery Of Whales The whale is a warm-blooded, air-breathing animal, giving birth to its young alive, sucking them—and, like all mammals, originated on land. There are many (1) of this. Its front flippers (鳍状肢), used for steering and stability, are traces of feet. Immense strength is (2) into the great body of the big whales, and in fact most of a whale's body is one gigantic muscle. The blue whale's pulling strength has been estimated (3) 400 horsepower. One specimen was reported to have towed (拖) a whaling vessel for seven hours at the (4) of eight knots (节). An angry whale will (5) a ship. A famous example of this was the fate of whaler Essex, (6) was sunk off the coast of South America early in the last century. More recently, steel ships have (7) their plates buckled (使弯曲) in the same way. Sperm whales (抹香鲸) were known to seize the old-time whaleboats in their jaws and crush them. The greatest (8) of whales is their diving ability. The sperm whale dives to the bottom for his (9) food, the octopus (章鱼). In that search he is known to go as far down as 3,200 feet, where the (10) is 1,400 pounds, to a square inch. Doing so he will (11) underwater long as one hour. Two special skills are involved in this: storing up enough (12) (all whales are air-breathed) and tolerating the great change in pressure. Just how he does it scientists have not (13) . It is believed that some of the oxygen is stored in a special (14) of blood vessels, rather than just held in the lungs. And it is believed that a special kind of oil in his head is some sort of compensating mechanism that (15) adjusts the internal pressure of his body. But since you can't bring a live whale into the laboratory for study, no one knows just how these things work.

单选题He picked a book from the bookshelf and then commenced to read.

单选题I was going to speak to an old friend across the room, but she Uignored/U me.

单选题The synergy of humans, society and machines is the fundmental cause of the Uunparalleled/U material prosperity of many nations.

单选题Evidently, he has made a big mistake this time.A. LikelyB. PossiblyC. ObviouslyD. Simply

单选题Medical Journals Medical journals are publications that report medical information to physicians and other health professionals. In the past, these journals were available only in print. With the development of electronic publishing, many medical journals now have Web sites on the Internet, and some journals are published only online. A few medical journals, like the Journal of the American Medical Association , are considered general medical journals because they cover many fields of medicine. Most medical journals are specialty journals that focus on a particular area of medicine. Medical journals publish many types of articles. Research articles report the results of research studies on a range of topics varying from the basic mechanisms of diseases to clinical trials that compare outcomes of different treatments. Review articles summarize and analyze the information available on a specific topic based on a careful search of the medical literature. Because the results of individual research studies can be affected by many factors, combining results from different studies on the same topic can be helpful in reaching conclusions about the scientific evidence for preventing, diagnosing or treating a particular disease. Case conferences and case reports may be published in medical journals to educate physicians about particular illnesses and how to treat them. Editorials in medical journals are short essays that express the views of the authors, often regarding a research or review article published in the same issue. Editorials provide a perspective on how the current article fits with other information on the same topic. Letters to the editor provide a way for readers of the medical journal to express comments, questions or criticisms about articles published in that journal.

单选题He endured great pain before he finally Uexpired/U.

单选题Many egg-laying animals merely lay their eggs and leave. With turtles, for instance, and horseshoe crabs, the eggs hatch and the little ones are on their own. The current theory about birds is the earliest birds did just that when they were cold—blooded creatures living in warln places. However, when they became warm-blooded creatures living in cold places, they had to remain on the eggs to keep them warm. For this, they needed a place—a nest. Very likely, the first nest was just primitive hole scraped in the ground. Even now many species still lay eggs in this sort of crude nest. Primitive nests found on the ground were fine for some birds, but others began to elevate their nests in branches, perhaps to avoid predators. These early elevated nests were probably loose platforms of sticks and dried leaves. The type is still built by some birds today. The latest development in nests, the most recent version, so to speak, is the cup-shaped nest. This is the one we regard today as the typical bird's nest, you know, like a robin's nest. According to the current theory, the earliest birds laid their eggs and left ifA. they were warm-blooded animals living in cold places.B. they were warm-blooded animals living in warm places.C. they were cold-blooded animals living in cold places.D. they were cold-blooded animals living in warm places.