单选题27. If there are a lot of interesting people and good food, we won't object to ______ to the welcome party.

单选题10. Early philosophers believed that the mind was divided into three faculties ______ as feeling, intellect, and will.

单选题1. The man was prejudiced ______ all people of color.

单选题 ______ break up rock

单选题25. It is easy to think that a witness who saw a crime ______ will be able to give all the answer.

单选题. New Findings on Memory Could Enhance Learning 关于记忆的新发现有助于学习 New research in monkeys may provide a clue about how the brain manages vast amounts of information and remembers what it needs. Researchers at Wake Forest University Baptist Medical Center have identified brain cells that streamline and simplify sensory information, markedly reducing the brain's workload. "When you need to remember people you've just met at a meeting, the brain probably doesn't memorize each person's facial features to help you identify them later," says Sam Deadwyler, Ph.D., a Wake Forest neuroscientist and study investigator. "Instead, it records vital information, such as their hairstyle, height, or age, all classifications that we are familiar with from meeting people in general. Our research suggests how the brain might do this, which could lead to ways to improve memory in humans." The researchers found that when monkeys were taught to remember computer clip art pictures, their brains reduced the level of detail by sorting the pictures into categories for recall, such as images that contained "people," "buildings," "flowers," and "animals." The categorizing cells were found in the hippocampus, an area of the brain that processes sensory information into memory. It is essential for remembering all things including facts, places, or people, and is severely affected in Alzheimer's disease. "One of the intriguing questions is how information is processed by the hippocampus to retain and retrieve memories," said Robert Hampson, Ph.D., co-investigator. "The identification of these cells in monkeys provides evidence that information can be remembered more effectively by separating it into categories. It is likely that humans use a similar process." The researchers measured individual cell activity in the hippocampus while the monkeys performed a video-game-like memory task. Each monkey was shown one clip art picture, and after a delay of one to 30 seconds, picked the original out of two to six different images to get a juice reward. By recording cell activity during hundreds of these trials in which the pictures were all different, the researchers noticed that certain cells were more active when the pictures contained similar features, such as images of people but not other objects. They found that different cells coded images that fit different categories. "Unlike other cells in the brain that are devoted to recording simply an object's shape, color or brightness, the category cells grouped images based on common features, a strategy to improve memory," said Terry Stanford, a study investigator. "For example, the same cell responded to both tulips and daisies because they are both flowers." The researchers found, however, that different monkeys classified the same pictures differently. For example, with a picture of a man in a blue coat, some monkeys placed the image in the "people" category, while others appeared to encode the image based on features that were not related to people such as "blue objects" or "types of coats." While such categorization is a highly efficient memory process, it may also have a downside, said the researchers. "The over generalization of a category could result in errors," said Deadwyler. "For example, when the trials included more than one picture with people in it, instead of different images, the monkeys often confused the image with a picture of other people." The researchers said that learning more about how the brain remembers could have for reaching benefits. "If we can understand in advance how the brain works when decisions are made, we can predict when the brain will make a mistake, and correct it," said Tim Pons, Ph.D., an expert in monkey research and team member. "This finding about how large amounts of information are processed by the brain will help us ultimately achieve that goal."16. According to Sam Deadwyler, a neuroscientist, when we meet people we need to remember, the brain probably memorizes ______.

单选题 After yuppies and dinkies

单选题. Depending on whether you believe in principle or the art of the possible, the United Nations' new proposal for the future of Western Sahara is either a betrayal or a dogged 21 at a settlement. It suggests that for the next four years Western Sahara should be a part of Morocco 22 will 23 the Moroccan flag and 24 the Moroccan constitution, hut at the same time it will be "autonomous". After four years there may—but only may—be a referendum to decide whether it stays Moroccan or becomes a separate state. Morocco invaded this corner of north-west Africa in 1975 when the old colonial power, Spain, was preparing to 25 out. The International Court of Justice ruled the Moroccan occupation 26 , and a nasty little war ensued between Morocco and an independence movement, the Polisario Front. They signed a 27 in 1991, and agreed to a vote on the future of the territory, 28 by the UN. Instead of grinding 29 an appeals procedure, or declaring Morocco to be in 30 , the UN now appears to have decided to abandon the whole exercise. The result may be virtually to hand the country 31 to Morocco. The new plan, drawn up by James Baker, a former American secretary of state, 32 that the agreed list of voters should elect an executive that will. 33 the country's internal affairs for the next four years. 34 , this executive will be responsible to an assembly elected by all adults now living in the territory, most of 35 are pro-Moroccan. After four years the assembly will 36 a new executive. Morocco will also appoint the judges and be responsible for law and order 37 the transition. Polisario has, unsurprisingly, rejected the proposal, but its options are 38 . It can hardly go back to war without Algerian 39 , which looks 40 . And retiring for a sulk in the Sahara desert is hardly an eye-catching form of protest.21.

单选题 The meeting was to ______ at ten o'clock

单选题. Breakthrough Mine-detection Turns Ocean Floor "Transparent" 突破性的探雷技术使得海床“一览无余” Since 1776, when naval mines were invented, navies have rightfully feared the stealthy and relatively simple weapons, which can disable or destroy warships and paralyze vital shipping. Navies worldwide employ a host of mine-detection technologies and techniques, most of them complicated, expensive, and far from perfect. So a simpler, more effective method for detecting these mines, developed by a physicist at North Carolina State University, could make big waves in naval headquarters around the globe. Unlike current mine-detection techniques, the patented methodology finds objects buffed in the ocean floor without the use of complex, unreliable modeling and without the usual arrays of sonar transmitters and receivers. Instead, the method records the return echo of a sonar transceiver's "ping", then time-reverses and transmits that signal. The following echo clearly shows buffed objects, and suppresses the response from the seafloor itself, making the underwater terrain "transparent." Dr. David M. Pierson, then a doctoral student in physics at NC State, demonstrated the new approach in research he conducted with Dr. David E. Aspnes, Distinguished University Professor of Physics, in late 2003. The project was supported by a grant from the Office of Naval Research. Pierson has since joined the Applied Physics Laboratory of Johns Hopkins University in Baltimore, where his work is supported in part by the US Navy. "The method has not been explored as a solution to this problem until now," said Pierson. "Using time reversal on the return echoes back scattered by buffed mines gave us results we considered amazing." According to Aspnes, the young physicist's research is a breakthrough. "Time reversal is a technique that has been used before in various contexts, including optics and acoustics, but before Pierson's work the advantages of time reversal for isolating targets in backscattered signals were never before recognized." Using time reversal to find buffed mines requires only one transceiver, said Pierson, although more can be used, and the method isn't limited by the composition of the ocean floor. "Previous methods had to incorporate a lot of complex modeling of the seafloor and the ocean environment," Pierson said, "and required sophisticated software and hardware systems. My time-reversal technique not only simplifies the needed equipment, but also can be implemented using existing sonar equipment, with minor software changes. More elaborate analyses of echoes are also made possible." What Pierson has done, said Aspnes, is to demonstrate a new approach that uses sonar but is simpler and works better than any previous method. "In Pierson's approach," he said, "a ping' is first transmitted from a sonar transceiver. The return echo is then recorded, time-reversed, and transmitted. He discovered that in the next echo the response from the seafloor was suppressed, but the echo from buried objects was enhanced. This enhancement is seen even if the signal from the buried object is too small to be detected in the first return." The NC State discovery should please naval mine-detection experts, who now use everything from dolphins to divers to sophisticated software modeling and elaborate sonar arrays in their grim work. And it should send those who design such mines back to their equally grim drawing boards.11. Before the NC State discovery of a new method for detecting naval mines, ______.

单选题 Pumas, which are larger, cat-like animals

单选题 When an invention is made

单选题. Sea rise as a consequence of global warming would immediately threaten that large fraction of the globe living at sea level. Nearly one-third of all human beings live within 36 miles of a coastline. Most of the world's great seaport cities would be 21 : New Orleans, Amsterdam, Shanghai, and Cairo. Some countries—Maldives Islands in the Indian Ocean, islands in the Pacific—would be inundated. Heavily populated coastal areas such as in Bangladesh and Egypt, 22 large populations occupy low-lying areas, would suffer extreme 23 . Warmer oceans would spawn stronger hurricanes and typhoons, 24 in coastal flooding, possibly swamping valuable agricultural lands around the world. 25 water quality may result as 26 flooding which forces salt water into coastal irrigation and drinking water supplies, and irreplaceable, natural 27 could be flooded with ocean water, destroying forever many of the 28 plant and animal species living there. Food supplies and forests would be 29 affected. Changes in rainfall patterns would disrupt agriculture. Warmer temperatures would 30 grain-growing regions pole-wards. The warming would also increase and change the pest plants, such as weeds and the insects 31 the crops. Human health would also be affected. Warming could 32 tropical climate bringing with it yellow fever, malaria, and other diseases. Heat stress and heat mortality could rise. The harmful 33 of localized urban air pollution would very likely be more serious in warmer 34 . There will be some 35 from warming. New sea-lanes will open in the Arctic, longer growing seasons further north will 36 new agricultural lands, and warmer temperature will make some of today's colder regions more 37 . But these benefits will be in individual areas. The natural systems—both plant and animal—will be less able than man to cope and 38 . Any change of temperature, rainfall, and sea level of the magnitude now 39 will be destructive to natural systems and living things and hence to man as well. The list of possible consequences of global warming suggests very clearly that we must do everything we can now to understand its causes and effects and to take all measures possible to prevent and adapt to potential and inevitable disruptions 40 by global warming.21.

单选题 In 1983

单选题. Egyptian wine has an extensive history within the history of Egyptian civilization. Grapes were not 21 to the landscape of Egypt, rather the vines themselves are 22 to have been imported from the Phoenicians, 23 the actual origins remain in 24 . 25 is known, is that by the third millennium BC, Egyptian kings of the first 26 had extensive wine cellars, and wine was used extensively in the temple ceremonies. The main 27 of wine in Egypt took place between the king, nobles, and the priests in temple ceremonies and is 28 by numerous painted reliefs, and other 29 evidence. Later, 30 , the viticulture (or wine making) ceased to 31 exclusively ceremonial purposes, the Egyptians began to experiment with simple structures for their vines to train on, 32 found a way to train their vines so they were easy low 33 bushes, and found ways for the soil to 34 more moisture for the vines. Egyptian wine making experiments included the use of different wine presses, adding heat to the must (the grape juice ready for fermentation) 35 make the wine sweet, and differences in vat types and materials. The 36 finished product of wine was poured through a cloth filter, and then into earthenware jars, 37 they would be sealed with natural tar and left to 38 . The Egyptians kept accurate records of their vintages, and 39 of their wines, each jar of wine was dearly 40 with its own vintage, and quality.21.

单选题 In areas away from the poles

单选题8. It was quite some time ______ the president managed to save his firm from bankruptcy.

单选题 While crossing the mountain areas

单选题. It is natural for young people to be critical of their parents at times and to blame them for most of the misunderstandings between them. They have always complained, more or 1 justly, that their parents are out of touch 2 modern ways; that they are possessive and dominant; 3 they do not trust their children to deal with crises; that they 4 too much about certain problems—and that they have no 5 of humor, at least in parent-child relationships. I think it is true that parents often 6 their teenage children and also forget how they themselves felt 7 young. Young people often irritate their parents with their 8 if clothes and hairstyles, in entertainers and music. This is not their 9 . They feel cut off from the adult world into which they have not 10 been accepted. So they create a culture and society of their own. 11 , if it turns out that their music or entertainers or vocabulary or clothes or hairstyles 12 their parents, this gives them additional enjoyment. They feel they are 13 , at least in a small way, and that they are leaders in style and 14 . Sometimes you are resistant, and proud because you do not want your parents to 15 of what you do. If they did approve, it looks as if you are 16 your own age group. But in that case, you are 17 that you are the underdog (失败者): you can't win but at least you can keep your honor. This is a 18 way of looking at things. It is natural enough after long years of childhood, 19 you were completely under your parents' control. But it 20 the fact that you are now beginning to be responsible for yourself. So if you plan to control your life, cooperation can be part of that plan.1.

单选题27. The workers went on strike against the government's plan ______ the prices of daily necessities.