单选题This kind of cloth ______ well. A. washes B. wash C. is washed D. is washing

单选题Speaker A: Peter, I"m awfully sorry. I won"t be able to come this Friday. Speaker B: What"s the matter? ______.

单选题The fire ______ two persons' death as well as the damage of all the store's property. A. is resulted in B. is resulted from C. resulted in D. resulted from

单选题The each {{U}}revolves {{/U}}both round the sun and on its own axis.

单选题Last Sunday he was seen ______ well on the stage. A．play a part B．to act C．playing D．invent

单选题One of the people who______in the accident said______wouldn't go to the hospital.

单选题Passage One America's economic recovery remains uncomfortably weak. The latest data show industrial production falling while the trade deficit soars to record levels. To round off a dismal week for economic statistics, the Fed (美联储) announced that industrial production fell by 0.2% in December compared with the previous month. That came as a disappointment to economists who had been expecting a small rise. Monthly data are always unreliable, of course; there is always a plausible explanation for unexpectedly bad(or good) news. But nearly all recent economic statistics point to the same conclusion—that America's recovery remains sluggish and erratic. It could put pressure on the Fed to consider cutting interest rates again when its policymaking committee meets at the end of the month. The biggest obstacle to healthier economic performance, though, is political. As the Fed's chairman, Alan Greenspan, acknowledged in the closing months of 2002, uncertainty about the future is holding both investors and consumers back. The shadowy threat of international terrorism and the much more explicit prospect of a war with Iraq have made many Americans nervous about the future. For businesses still reeling from the speed at which the late-1990s boom turned to slump, the political climate is one more reason to put off investing in new plant and equipment or hiring new staff. For consumers, for so long the mainstay of the American economy, the thrill of the shopping mall seems, finally, to be on the wane. It is hard to put a favorable interpretation on most of the data. But it is important to keep a sense of perspective. Some recent figures look disappointing partly because they fall short of over-optimistic forecasts—a persistent weakness of those paid to predict the economic future, no matter how often they are proved wrong. The Fed will be watching carefully for further signs of weakness during the rest of the month. Mr. Greenspan is an avid, even obsessive, consumer of economic data. He has made it clear that the Fed stands ready to reduce interest rates again if it judges it necessary—even after 12 cuts in the past two years. At its last meeting, though, when it kept rates on hold, the Fed signaled that it did not expect to need to reduce rates any further. Monetary policy still offers the best short-term policy response to weak economic activity, and with the low inflation the Fed still has scope for further relaxation. The former President Bush's much-vaunted fiscal stimulus is unlikely to provide appropriate help, and certainly not in a timely way.

单选题Every man in this country has the right to live where he wants to ______ the color of his skin. A. with the exception of B. in the light C. by virtue of D. regardless of

单选题We are making good progress, but we must not______until we have achieved our objective.

单选题Man: I heard you"ve got a wonderful job in a post office. How"s your new job going? Women: I just feel like a fish out of water. Question: What does the woman feel about her new job?

单选题It was lack of money, not of effort, ______ defeated their plan.A．whichB．asC．thatD．what

单选题This crop has similar qualities to the previous one, ______ both wind-resistant and adapted to the same type of soil. A. being B. been C. to be D. having been

单选题He stated that unless I ceased harassing Sir William he would not be prepared to defend me.

单选题The (people native) to the northwest coast of North American have long (be known) (for) wood carvings (of) stunning beauty and extraordinary quality.

单选题A: We just came back from hoenix. And we had the best vacation is years. B: ______ I'm glad to hear it.

单选题{{B}}Text 2{{/B}} Information technologists have dreamt for decades of making an electronic display that is as good as paper: cheap enough to be pasted on to wails and billboards, clear enough to be read in broad daylight, and thin and flexible enough to be bound as hundreds of flippable leaves to make a book. Over the past few years they have got close. In particular, they have worked out how to produce the display itself, by sandwiching tiny spheres that change colour in response to an electric charge inside thin sheets of flexible, transparent plastic. What they have not yet found is a way to mass-produce flexible electronic circuitry with which to create that charge. But a paper just published in the Proceedings of the National Academy of Sciences suggests that this, too, may be done soon. The process described by John Rogers and his colleagues from Bell Laboratories, an arm of Lucent Technologies, in New Jersey, and E Ink Corporation, in Cambridge, Massachusetts, starts with E Ink's established half-way house towards true electronic paper. This is based on spheres containing black, liquid dye and particles of white, solid pigment. The pigment particles are negatively charged, so they can be pushed and pulled around by electrodes located above and below the sheet. The electrodes, in turn, are controlled by transistors under the sheet. Each transistor manipulates a single picture element (pixel), making it black or white. The pattern of pixels, in turn, makes up the picture or text on the page. The problem lies in making the transistors and connections. Established ways of doing this, such as photolithography, use silicon as the semiconductor in the transistors. That is all right for applications suck as pesters. It is too fragile and too expensive, though, for genuine electronic paper—which is why cheap and flexible electronic components are needed. For flexibility, Dr Rogers and his colleagues chose pentacene as their semiconductor, and gold as their wiring. Pentacene is a polymer whose semiconducting properties were discovered only recently. Gold is the most malleable metal known, and one of the best electrical conductors. Although it is pricey, so little is needed that the cost per article is tiny. To make their electronic paper the researchers started with a thin sheet of Mylar, a tough plastic, that was coated with indium-tin oxide (ITO), a transparent electrical conductor. To carve this conductor into a suitable electric circuit, they used an innovation called microcontact printing lithography. This trick involves printing the pattern of the circuit on to the ITO using a rubber stamp. The "ink" in the process is a solvent-resistant chemical that protects this part of the ITO while allowing the rest to be dissolved.

单选题{{B}}Text 3{{/B}} It's not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities. "One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained. "This is a native species that's doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don't know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They're called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They're considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It's possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said. "In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don't have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It's possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we'd like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don't outcompete beneficial species. Future studies on odorous house ants will include studying the ant's genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.

单选题The phrase "function in the disservice of one another" ( Line 7, Par

单选题You will find a tall building ______ the end of the road. A．on B．in C．by D．at

单选题Long-suffering couples take heart. There is a good reason for those endless arguments in the front of the car: men and women use different parts of the brain when they try to find their way a-round, suggesting that the strategies they use might also be completely different. Matthias Riepe and his colleagues at the University of Ulm in Germany asked 24 healthy volunteers—half of them men, half women—to find their way out of three virtual-reality mazes displayed on video goggles. Meanwhile, the researchers monitored the volunteers" brain activity using a functional magnetic resonance imaging(fMRI)scanner. This showed that men and women called on strikingly different brain areas to complete the task. "I didn" t expect it to be so dramatic," says Riepe. Previous studies have been shown that women rely mainly on landmarks to find their way. Men use these cues too, but they also use geometric cues, such as the angle and shape of a wall or a corner. Such studies also suggest that men navigate their way out of unfamiliar spaces more quickly, as Riepe found in his study, too. Riepe discovered that both men and women used parts of the parietal cortex towards the top of the brain, the right side of the hippocampus and a few other well-established areas to find their way out. Neuroscientists think that the parietal regions help translate what the eyes see into information about where the body is in space, while the hippocampal region helps process how objects are arranged. But other regions seemed to be exclusively male or female. The men engaged the left side of their hippocampus, which the researchers say could help with assessing geometry or remembering whether they have already visited a location. The women, by contrast, recruited their right frontal cortex. Riepe says this may indicate that they were using their "working memory" , trying to keep in mind the landmarks they had passed. "It fits very well with the animal studies," says Riepe. He points out that there seem to be similar differences in rats. For example, damage to the frontal lobe will impair a female" s sense of direction, but not a male" s.