单选题This poem depicts the beautiful scenery of a small town in the South. A. describes B. draws C. writes D. introduces

单选题She has got a good job and earns {{U}}a lot of{{/U}} money.

单选题Trees 1. Trees are plants that survive year after year and have a single main stem composed entirely of wood. Some kinds grow to only ten feet, Others attain heights of more than 350 feet. These giants also have stems that are as much as 100 feet in circumference (圆周). 2. Over 25,000 different species of tree grow around the wood, except near the North and South Poles. They all belong to one of two possible groups. They are either coniferous (松类的) or deciduous (落叶的). Coniferous trees are evergreens (常绿的), such as pine or fir, which bear needlelike foliage (叶子) all year long. Many deciduous trees have broad leaves, which they usually shed each year at the beginning of the cold season. 3. Trees provide people with a host of oils, drugs glues, candy, cloths, fuels, and well over 10,000 wooden products. Some have unique qualities that make their wood valuable for special purposes. One particular type of tree, for example, is used to make fishing rods because it is not strong but unusually flexible. Queensland walnut is used by the electrical industry in Australia, because it is almost as good an electrical insulator as rubber. One of the world most unusual trees is the teak (柚木). It is one of the heaviest of all woods, and it has the largest leaves of any tree. These enormous leaves are two feet square and their surface is so tough and coarse that cabinetmakers in India use them as sandpaper. Teakwood itself is so heavy that when a teak tree is first cut down it will not float in water. It takes three years for the ten or fifteen-ton trunk to dry out enough so it will not sink. 4. Of all the world"s billions of living trees, the tallest is a giant redwood in California. It towers 368 feet. This redwood tree is anchored and nourished by a massive root system. It extends over three full acres.

单选题Everyone aboard the ship perished when it sank.A. disappearedB. survivedC. woundedD. died

单选题She all but fainted when she heard the news.

单选题Patricia stared at the other girls with resentment.A. loveB. surpriseC. angerD. doubt

单选题The loss of her cat was the greatest Ugrief/U the child had known.

单选题The house stands as steady as a rock in the wind.A. continuousB. quickC. firmD. exceptional

单选题It is obvious that he will win the game.

单选题High-tech Warfare Today, high-tech warfare (战争) is no longer an abstract concept, but a real issue. Technology 1 tactics, sociology, and the development of weaponry (武器). It also causes the changes in battles. Then what are the new characteristics of modern battles 2 by the application of high technologies? High-tech warfare naturally includes high technology. In modern battles, a single kind of weapon can hardly be 3 . Various weaponry, such as intelligence detection and information processing, should 4 well with each other. Aerial (航空的) weaponry becomes the main force in battles in the sky. Precision homing (精确自导) weaponry like cruise missiles and missiles 5 satellite homing systems becomes the main attack weapons. Battle control systems play a dominant role. Various weapons and logistics (后勤) systems are 6 into a comprehensive framework, centrally representing the modern high-tech weaponry. Depending on various 7 equipment and means in electronic warfare, our army will not be passively beaten. 8 the battlefield, high-tech warfare has created a type of non-linear (非线性的) chaos. Because of the use of long-range precision weaponry, the opposite parties in warfare can"t "touch" or "see" each other, and distance is no longer the decisive factor affecting the 9 of battles. It is hard to clearly define the lines between the frontier and the rear, as well as attack and defense. The traditional three-dimensional air-sea battlefield will be 10 by the multi-dimensional battlefield composed of air, sea, magnetic, electrical and information battlefields. No large-scale movements can be conducted 11 . Because modern weaponry systems are closely related to chains of demand and communication and electronic technology, the parties 12 have to pay attention to the usufruct (使用权) and control of electromagnetic frequency spectrum. So electronic warfare becomes 13 important and the necessary guarantee of victory. Whatever 14 warfare goes to and whatever Cloak (宽大外衣) it wears, it always violates peace and brings the world bloodshed (流血). Most people think of high technology as a 15 to enhance their lives, and they don"t wish it to be used to destroy lives.

单选题During his life he was able to accumulate quite a fortune.

单选题Almost everyone at the meeting has different {{U}}views{{/U}}.

单选题Jack is a diligent worker.

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Electric Backpack Backpacks are convenient. They can hold your books, your lunch, and a change of clothes leaving your hands free to do other things. Someday, if you don't mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone running, and maybe even light your way home. Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in WoodsHole, Mass. have invented a backpack that makes electricity from energy produced while its wearer walks. In military actions search-and-rescue operations and scientific field studies, people rely increasingly on cell phones global positioning system (GPS) receivers, night-vision goggles, and other battery powered devices to get around and do their work. The backpack's electricity-generating feature could dramatically reduce the amount of a wearer's load now devoted to spare batteries, report Rome and his colleagues in the Sept.9 science. The backpack's electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer's back, and the whole pack moves up and down as the person walks. A gear mechanism converts vertical movements of the pack to rotary motions of an electrical generator, producing up to 7.4 watts. Unexpectedly, tests showed that wearers of the new backpack alter their gaits in response to the pack's oscillations, so that they carry loads more comfortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to commercialize both electric and non-electric versions of the backpack. The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. For the rest of us, power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricity-generating packs aren't on the market yet, but if you do get one eventually just make sure to look both ways before crossing the street!

单选题{{B}}第二篇{{/B}} Valuing Childhood The value of childhood is easily hturred (变得模糊不清) in today's world. Consider some recent developments: The child-murderers in the Jonesboro, Ark. schoolyard shooting case were convicted and sentenced. Two boys, 7 and 8, were charged in the murder of an 11-year-old girl in Chicago. Children who commit horrible crimes appear to act of their own will. Yet, as legal proceedings in Jonesboro showed, the one boy who was able to address the court couldn't begin to explain his acts, though he tried to apologize. There may have been a motive-youthful jealousy(妒忌) and resentment. But a deeper question remains. Why did these boys and others in similar trouble apparently lack any inner, moral restraint? That question echoes for the accused in Chicago, young as they are. They wanted the girl's bicycle, a selfish impulse common enough among kids. Redemption (拯救) is a practical necessity. How can value be restored to young lives distorted by acts of violence? The boys in Jonesboro and in Chicago will be confined in institutions for a relatively short time. Despite horror at what was done, children are not-cannot be-dealt with as adults, not if a people wants to consider itself civilized. That's why politicians' cries for adult treatment of youthful criminals ultimately miss the point. But the moral void(真空)that invites violence has many sources. Family instability con-tributes. So does economic stress. That void, however, can be filled. The work starts with parents, who have to ask themselves whether they're doing enough to give their children a firm sense of right and wrong. Are they really monitoring their activities and their developing processes of thought? Schools, too, have a role in building character. So do youth organizations. So do law enforcement agencies, which can do more to inform the young about laws, their meaning, and their observance (遵守). The goal, ultimately, is to allow all children a normal passage from childhood to adulthood (成 年), so that tragic gaps in moral judgement are less likely to occur. The relative few who fill such gaps with acts of violence hint at many others who don't go that far, but who lack the moral foundations childhood should provide-and which progressive human society relies on.

单选题Mars Probe Watches Water-ice Fade The pictures acquired by a NASA orbiter(卫星) show white material exposed by flesh meteorite impacts fading over time-behaviour expected of ice on Mars. An onboard instrument also detected the tell-tale chemical signature of water. To date, exposed water-ice has only been seen at very high latitudes. The US space agency's (NASA) recent Phoenix probe famously dug into water-ice at its" high Arctic" landing site. The implication, even with the small set of examples scientists now have, is that broad deposits of ice sit just below the red top-soil of Mars. "There's a consistent picture starting to emerge now that these broad sheets may be common on Mars," observed Shane Byme of the University of Arizona, a member of the team running the HiRISE camera on NASA's Mars Reconnaissance Orbiter (MRO). "The volume of water is probably comparable to the volume that we would have in the Greenland ice sheet on the Eanh-in the buried ice deposits that stretch from each pole to mid-latitudes. " MRO has produced" earlier" and" later" images at five fresh impact sites made in 2008. These were all halfway between the North Pole and the equator on Mars. The craters (环形山, 陨石坑) were small, just a few metres across, gouged out by incoming space rocks that may have been no more than 10cm in size. The bright, white deposits uncovered by the impacts were seen to wither over time, something exposed water-ice cannot help but do in the low-pressure Martian atmosphere. It is bound to sublimate-to tum directly from a solid into a Vapour. However, the length of time it took to fade was a good indication that the ice was very pure. Had it contained a lot of dirt mixed in with it, the ice would have sublimated much quicker, scientists said. The discoveries made by MRO are said to indicate that Mars had a more humid climate in the relatively recent past, within the last 10,000 years. Scientists suspect much of this ice came out of the atmosphere. Water vapour in the atmosphere will diffuse through the particles of the soil until it gets to a certain depth where it then freezes. The locations of the exposed ice fit with the models used to predict where ground ice might be stable, i. e. from mid up to high latitudes. "The more humid the Martian atmosphere, the more extensive the area of this stable ice. " explained Shane Byme. "Based on the locations of these craters, we are able to say something about how much water was in the Martian atmosphere recently, and that turns out to be a lot more than is in the atmosphere today—maybe almost double what's in the atmosphere today. /

单选题Techniques to employ the energy of the sun are being developed.

单选题Do not waste time on insignificant points.

单选题World Crude Oil Production May Peak Decade Earlier Than Some Predict In a finding that may speed efforts to conserve oil, scientists in Kuwait predict that world conventional crude oil production will peak in 2014. This prediction is almost a decade earlier than some other predictions. Their study is in ACS' Energy & Fuels. lbrahim Nashawi and colleagues point out that rapid growth in global oil consumption has sparked a growing interest in predicting "peak oil". "Peak oil" is the point where oil production reaches a maximum and then declines. Scientists have developed several models to forecast this point, and some put the date at 2020 or later. One of the most famous forecast models is called the Hubbert model. It assumes that global oil production will follow a bell shaped curve. A related concept is that of "Peak Oil". The term "Peak Oil" indicates the moment in which world wide production will peak, afterwards to start on irreversible decline. The Hubbert model accurately predicted that oil production would peak in the United States in 1970. The model has since gained in popularity and has been used to forecast oil production worldwide. However, recent studies show that the model is insufficient to account for more complex oil production cycles of some countries. Those cycles can be heavily influenced by technology changes, politics, and other factors, the scientists say. The new study describes development of a new version of the Hubbert model that provides a more realistic and accurate oil production forecast. Using the new model, the scientists evaluated the oil production trends of 47 major oil-producing countries which supply most of the world's conventional crude oil. They estimated that worldwide conventional crude oil production will peak in 2014, years earlier than anticipated. The scientists also showed that the world's oil reserves are being reduced at a rate of 2.1 percent a year. The new model could help inform energy-related decisions and public policy debate, they suggest.