单选题You"ll have to sprint if you want to catch the train.

单选题Loud noises can be irritating． A. confusing B. interesting C. stimulating D. annoying

单选题Bees and Colour On our table in the garden we put a blue card, and all around this blue card we put a number of different grey cards. These grey cards are of all possible shades of grey and include white and black. On each card a watch-glass is placed. The watch-glass on the blue card has some syrup(果汁) in it, all the others are empty. After a short time bees find the syrup, and they come for it again and again. Then, after some hours, we take away the watch-glass of syrup which was on the blue card and put an empty one in its place. Now what do the bees do? They still go straight to the blue card, although there is no syrup there. They do not go to any of the grey cards, in spite of the fact that one of the grey cards is of exactly the same brightness as the blue card. Thus the bees do not mistake any shade of grey for blue. In this way we have proved that they do really see blue as a colour. We can find out in just the same way what other colours bees can see. It turns out that bees can see various colours, but these insects differ from us as regards their colour-sense in two very interesting ways. Suppose we train bees to come to a red card, and, having done so, we put the red card on the table in the garden among the set of different grey cards. This time we find that the bees mistake red for dark grey or black. They cannot distinguish between them. This means that red is not a cotour at all for bees; for them it is just dark grey or black. That is one strange fact; here is another. A rainbow is red on one edge, violet on the other. Outside the violet of the rainbow there is another colour which we cannot see at all. This colour beyond the violet, invisible to us, is called the ultra-violet. Although it is invisible, we know that the ultra-violet is there because it affects a photographic plate. Now, although we are unable to see ultra-violet light, bees can do so; for them ultra-violet is a colour. Thus bees see a colour which we cannot even imagine. This has been found out by training bees to come for syrup to various parts of a spectrum, or artificial rainbow, thrown by a prism on a table in a dark room. In such an experiment the insects can be taught to fly to the ultra-violet, which for us is just darkness.

单选题Those shops flourished along the highway being built.A. appearedB. gainedC. benefitedD. prospered

单选题The great changes Uastonished/U every visitor to that city.

单选题 Green Roof Research The concept of green roofs is basically about growing plants on roofs, thus helping to replace the green footprint that had been destroyed due to the construction of the building. Green roofs are the most prevalent (流行) in Germany, which is widely regarded as the leader in green roof research. The green roofs that are used these days can be classified as "extensive" and "intensive" systems. Extensive green roofs use mosses, grasses and herbs, which are tolerant to droughts. These plants do not need much maintenance, can be grown in a layer of substrate (土层) that can be as shallow as 1.5 inches, and generally are inaccessible to the public. In contrast, a wide range of species of plants are grown on intensive green roofs, such as shrubs (灌木) and even trees, which require deeper substrate layers, and are usually grown on fiat roofs. They need intensive maintenance, and are usually areas that resemble parks which are accessible to people. There are several benefits of adopting green roof technologies. Apart from the obvious psychological and aesthetic (美学的) benefits of garden-like environments surrounding you, some of the common economic and ecological benefits are: a reduction in the consumption of energy; air and water purification; recovering green spaces; and the mitigation (缓解) of the heat island effect in urban areas. The green roof research that is currently ongoing is focused on evaluating the species of plants that are suitable to be grown on roofs, the methods of propagation (繁殖) as well as establishment, nutrient (养料) and water requirement, substrates, and the quantity and quality of water runoff. The evaluation criteria of plant species are: at what rate they can be established their capacity to withstand invasive weeds; tolerance of cold and heat; tolerance of drought conditions; capacity of persistence and survival. A number of experiments are being conducted on roof platform simulations at various research centers. These sites are generally outfitted with equipment, which are used to measure temperatures at different depths of the growing substrates, and the rate and volume of the runoff of stormwaters from each of the platforms. Green roof technology is representative of a completely new market for landscape contractors, and all roofs that currently exist and the future ones to be constructed are the potential market-a market that is too huge to be overlooked.

单选题In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words (51) which we become acquainted in daily conversation, which we (52) , that is to say, from the (53) of our own family anti from our familiar associates, and (54) we should know and use (55) we could not read or write. They (56) the common things of lift, anti are the stock in trade of all who (57) the language. Such words may be called" popular", since they belong to the people (58) and are not the exclusive (59) of a limited class. On the other hand ,our language (60) a multitude of words which are comparatively seldom used in ordinary conversation. Their meanings are known to every educated person, but there is little (61) to use them at home or in the market-place. Our (62) acquaintance with them comes not from our mother's lips or from the talk of our schoolmates, but from books that we read, lectures that we attend, or the more formal conversation of highly educated speakers who arc discussing some particular (63) in a style appropriately elevated above the habitual (64) of everyday life. Such words are called "learned", and the (65) between them and the "popular" words is of great importance to a right understanding of linguistic process.

单选题I {{U}}rarely{{/U}} play basketball. A. normally B. seldom C. frequently D. usually

单选题 Easy Learning Students should be jealous. Not only do babies get to doze their days away, but they've also mastered the fine art of learning in their sleep. By the time babies are a year old, they can recognize a lot of sounds and even simple words. Marie Cheour at the University of Turku in Finland suspected that they might progress this fast because they learn language while they sleep as well as when they are awake. To test the theory, Cheour and her colleagues studied 45 newborn babies in the first few days of their lives. They exposed all the infants to an hour of Finnish vowel sounds— one that sounds like "oo", another like "ee" and a third boundary vowel peculiar to Finnish and similar languages that sounds like something in between. EEG recordings of the infants brains before and after the session showed that the newborns could not distinguish the sounds. Fifteen of the babies then went back with their mothers, while the rest were split into two sleep-study groups. One group was exposed throughout their night-time sleeping hours to the same three vowels, while the others listened to other, easier-to-distinguish vowel sounds. When tested in the morning, and again in the evening, the babies who'd heard the tricky boundary vowel all night showed brainwave activity indicating that they could now recognise this new sound. They could identify the sound even when its pitch was changed, while none of the other babies could pick up the boundary vowel at all. Cheour doesn't know how babies accomplish this night-time learning, but she suspects that the special ability might indicate that unlike adults, babies don't "turn off" their cerebral cortex while they sleep. "The skill probably fades in the course of the first year of life", she adds, "so forget the idea that you can pick up tricky French vowels as an adult just by slipping a language tape under your pillow." But while it may not help grown-ups, Cheour is hoping to use the sleeping hours to give remedial help to babies who are genetically at risk of language disorders.

单选题For young children, getting dressed is a {{U}}complicated{{/U}} business. A.strange B.complex C.personal D.funny

单选题{{B}}第三篇{{/B}} There are two great mysteries about the beach. One is why human beings flock there by thousands, only to prostrate(俯卧) themselves in dense packs of glistening flesh. The other is why the sand goes there. Strange as it seems, oceanographers have never really understood why sand piles up on the shore. Now Douglas Inman and Daniel Conley think they have solved the puzzle. The puzzle had to do with waves. Though it might seem intuitive that waves carry water to shore, and sand along with it, it's not that simple. The crest(浪尖)of a passing wave lifts a given hit of water upward and landward, but the ensuing trough(波谷) pushes the water back down and Out to sea. Near the bottom, there the sand is, the water was always assumed to just slide back and forth—and the sand with it. "If you take a very aloof look at a beach," says Inman, "you'll realize that if the two motions move sand back and forth the same amount, then all the sand should end up in deep water.' So for beaches to exist, the crest's onshore flow must somehow move enough sand up the beach to counter the seaward tug of both the trough and gravity . The pressure changes in the sand bed, Inman and Conley think, are the key to beach creation. They found that sand doesn't just slide back and forth with each passing wave. Under a trough, it does slide seaward, in a thin layer just above the bottom. But under a crest its movement is often more elaborate. The higher pressure under a crest—higher because the water is piled higher—forces water into the porous(多孔的) sand. This creates strong whirlpools just above the sand, which help loosen it. As the crest passes overhead, the sand first rushes across the bottom; then it abruptly turns violent lifting off the bottom in large, boiling bunches. Finally, just after the crest passes, the sand explodes up into the great water column. The boiling and rushing move more sand than the backsliding under a trough, so there's a net movement of sand toward the shore.

单选题While we don't agree, we continue to be friends. A．Because B．Where C．Although D．Whatever

单选题He is suspicious about her motivation to attend the party.A. sureB. angryC. doubtfulD. worded

单选题The attack on Fort Sumter near Charleston provoked a sharp response from the North, which {{U}}led to{{/U}} the American Civil War.

单选题The girl is gazing at herself in the mirror.

单选题Patricia stared at the other girls with {{U}}resentment{{/U}}. A. anger B. doubt C. love D. surprise

单选题According to the American Red Cross, blood and plasma donors are urgently needed after natural disasters or other catastrophes.

单选题Then something happened to Cosmos. It may have sprung a small leak ; perhaps it struck a tiny asteroid (小行星) or a piece of debris. Nobody knows for sure, but for one reason or another. Cosmos drifted off course. T. S. Kelso, an aeronautics expert at Analytical Graphics. which provides satellite-tracking services to NASA, noticed that the orbits of Cosmos and Iridium were bringing the two satellites closer to each other all the time. In February he issued a waming that they would pass within a kilometer of one another. He was right. On Feb. 10, Motorola lost track of Iridium's signal. Over the next few days, Kelso and others surmised (推测) that what many had feared for years had finally come to pass: two intact (完好无损的) satellites had collided head on. What had happened to Cosmos and Iridium in February according to Kelso?A. They had had mechanical problems.B. They had struck a tiny asteroid.C. They has struck a piece of debris.D. They had collided into each other.

单选题A New Book All day long, you are affected by large forces. Genes influence your intelligence and willingness to take risks. Social dynamics unconsciously shape your choices. Instantaneous perceptions set off neutral reactions in your head without you even being aware of them. Over the past few years, scientists have made a series of exciting discoveries about how these deep patterns influence daily life. Nobody has done more to bring these discoveries to public attention than Malcolm Gladwell. Gladwell's new book Outliers seems at first glance to be a description of exceptionally talented individuals. But in fact, it's another book about deep patterns. Exceptionally successful people are not lone pioneers who created their own success, he argues. They are the lucky beneficiaries of social arrangements. Gladwell's noncontroversial claim is that some people have more opportunities than others. Bill Gates was lucky to go to a great private school with its own computer at the dawn of the information revolution. Gladwell's book is being received by reviewers as a call to action for the Obama Age. It could lead policy makers to finally reject policies built on the assumption that people are coldly rational profit-maximizing individuals. It could cause them to focus more on policies that foster relationships, social bonds and cultures of achievement. Yet, I can't help but feel that Gladwell and others who share his emphasis are preoccupied with the coolness of the discoveries. They've lost sight of the point at which the influence of social forces ends and the influence of the self-initiating individual begins. Most successful people begin with two beliefs: the future can be better than the present, and I have the power to make it so. They were often showered by good fortunes, but relied at crucial moments upon achievements of individual will. These people also have an extraordinary ability to consciously focus their attention. Control of attention is the ultimate individual power. People who can do that are not prisoners of the stimuli around them. They can choose from the patterns in the world and lengthen their time horizons. Gladwell's social determinism overlooks the importance of individual character and individual creativity. And it doesn't fully explain the genuine greatness of humanity's talents. As the classical philosophers understood, examples of individual greatness inspire achievement more reliably than any other form of education.

单选题Eleanor Roosevelt"s dedication to humanitarian causes won her affection and honor at home and abroad .