单选题If you want this painkiller, you'll have to ask the doctor for a______.(2006年中南大学考博试题)

单选题Sharks are ______.

单选题Fossils of plant that have been extinct for fifty million years have been found inlarge deposits of amber near the Baltic Se

单选题Once upon a time, the only ideologically acceptable explanations of mental differences between men and women were cultural. Any biologist who dared to suggest in public that perhaps evolution might work differently on the sexes, and that this might perhaps result in some underlying neurological inequalities, was likely to get tarred and feathered. Today, by contrast, biology tends to be an explanation of first resort in matters sexual. So it is beneficiary to come across an experiment which shows that a newly discovered difference which fits easily, at first sight, into the biological-determinism camp, actually does not belong there at all. Writing in Psychological Science, a team led by ran Spence of the University of Toronto describes a test performed on people"s ability to spot unusual objects that appear in their field of vision. Success at spatial tasks like this often differs between the sexes, so the researchers were not surprised to discover a discrepancy between the two. The test asked people to identify an "odd man out" object in a briefly displayed field of two dozen otherwise identical objects. Men had a 68% success rate. Women had a 55% success rate. Had they left it at that, Dr. Spence and his colleagues might have concluded that they had uncovered yet another evolved difference between the sexes, come up with a "Just So" story to explain it in terms of division of labour on the African savannah, and moved on. However, they did not leave it at that. Instead, they asked some of their volunteers to spend ten hours playing an action-packed, shoot-"em-up video game, called "Medal of Honour: Pacific Assault". As a control, other volunteers were asked to play a decidedly non-action-packed puzzle game, called "Ballance", for a similar time. Both sets were then asked to do the odd-man-out test again. Among the Ballancers, there was no change in the ability to pick out the unusual. Among those who had played "Medal of Honour", both sexes improved their performances. That is not surprising, given the different natures of the games. However, the improvement in the women was greater than the improvement in the men—so much so that there was no longer a significant difference between the two. Moreover, that absence of difference was long-lived. When the volunteers were tested again after five months, both the improvement and the lack of difference between the sexes remained. Though it is too early to be sure, it looks likely that the change in spatial acuity—and the abolition of any sex difference in that acuity—induced by playing "Medal of Honour" is permanent. That has several implications. One is that playing violent computer games can have beneficial effects. Another is that the games might provide a way of rapidly improving spatial ability in people such as drivers and soldiers. And a third is that although genes are important, upbringing matters, too. In this instance, exactly which bit of upbringing remains unclear. Perhaps it has to do with the different games that boys and girls play. But without further research, that suggestion is as much of a "Just So" story as those tales from the savannah.

单选题 Successful innovations have driven many older technologies to extinction and have resulted in higher productivity, greater consumption of energy, increased demand for raw materials, accelerated flow of materials through the economy and increased quantities of metals and other substances in use per person. The history of industrial development is full of examples. In 1870, homes and mules were the prime source of power on U.S. farms. One horse or many decades. At that time, had a national commission been asked to forecast the horse and mule population for 1970, its answer probably would have depended on whether its consultants were of an economic mm of mind. Had they been "economists", they would have recognized that the power of steam had already been harnessed to industry and to land and ocean transport. They would have recognized further that would be only a matter of time before steam would be the prime source of power on the farm. It would have been difficult for them to avoid the conclusion that the horse and mule population would decline rapidly.

单选题Children in America are taught to ______.

单选题The storm has caused ______ to this region. A) many damages B) much damages C) much damage D) few damages

单选题I have not the least ______ of hurting your feelings.

单选题从供选择的答案中，选出最确切的解答。 (1) data effectively is crucial for success in todays competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (2) in hardware and software. (3) integration uses a base document that contains copies of other objects. (4) integration uses a base document that contains the current or most recent version of the source document it contains. (5) provides an overview of the program written in plain English, without the computer syntax.

单选题So absorbed in the book ______ that he didnt notice me. A．he was B．he is C．was he D．is he

单选题The Mona Lisa is the portrait of a woman with a very enticing smile.

单选题The manager didn't have time to read the report word for word: he just ______ it.

单选题Since the situation is changing, let's take some ______ measures to deal with it. A. available B. changeable C. flexible D. considerable

单选题{{B}}Passage 2{{/B}} Women are, on the whole, more verbal than men. They are good at language and verbal reasoning, while men tend to be skilled at tasks demanding visual—spatial(视空)abilities. In fact, along with aggression, these are the most commonly accepted difference between these sexes. Words are tools for communicating with other people, especially information about people. They are mainly social tools. Visual and spatial abilities are good for imagining and manipulating objects and for communicating information about them. Are these talents programmed into the brain? In some of the newest and most controversial research in neurophysiology(神经生理学), it has been suggested that when it comes to the brain, males are specialists while women are generalists. But one knows that, if anything, this means in terms of the abilities of the two sexes. Engineering is both Visual and spatial, and it's true that there are relatively few women engineers. But women become just as skilled as men at shooting a rifle or driving a car, task that involve visual-spatial skills. They also do equally well at programming a computer, which is neither visual nor spatial. Women do, however, seem less likely to fall in love with the objects themselves. We all know men for whom machines seem to be extensions of their identity. {{U}}A woman is more likely to see her car, rifle, or computer as a useful tool but not in itself fascinating.{{/U}}

单选题The energy contained in rock within the earth"s crust represents a nearly unlimited energy source, but until recently commercial retrieval has been limited to underground hot water and/or steam recovery systems. These systems have been developed in areas of recent volcanic activity, where high rates of heat flow cause visible eruption of water in the form of geysers and hot springs. In other areas, however, hot rock also exists near the surface but there is insufficient water present to produce eruptive phenomena. Thus a potential hot dry rock (HDR) reservoir exists whenever the amount of spontaneously produced geothermal fluid has been judged inadequate for existing commercial systems. As a result of recent energy crisis, new concepts for creating HDR recovery systems—which involve drilling holes and connecting them to artificial reservoirs placed deep within the crest—are being developed. In all attempts to retrieve energy from HDRs, artificial stimulation will be required to create either sufficient permeability or bounded flow paths to facilitate the removal of heat by circulation of a fluid over the surface of the rock. The HDR resource base is generally defined to include crustal rock that is hotter than 150℃, is at depths less than ten kilometers, and can be drilled with presently available equipment. Although wells deeper than ten kilometers are technically feasible, prevailing economic factors will obviously determine the commercial feasibility of wells at such depths. Rock temperatures as low as 100℃ may be useful for space heating; however, for producing electricity, temperatures greater than 200℃ are desirable. The geothermal gradient, which specifically determines the depth of drilling required to reach a desired temperature, is a major factor in the recoverability of geothermal resources. Temperature gradient maps generated from oil and gas well temperature-depth records kept by the American Association of Petroleum Geologists suggest that tappable high-temperature gradients are distributed all across the United States. (There are many areas, however, for which no temperature gradient records exist.) Indications are that the HDR resource base is very large. If an average geothermal temperature gradient of 22℃ per kilometer of depth is used, a staggering 13,000,000 quadrillion B.T.U. "s of total energy are calculated to be contained in crustal rock to a ten-kilometer depth in the United States. If we conservatively estimate that only about 0.2 percent is recoverable, we find a total of all the coal remaining in the United States. The remaining problem is to balance the economics of deeper, hotter, more costly wells and shallower, cooler, less expensive wells against the value of the final product, electricity and/or heat.

单选题The Hero in Romance is usually the

单选题Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. For many parents, summer is oppressive not mostly because of the heat but because of scheduling. The lengthening days are a hint of the specter of more than 50 million school-age {{U}} {{U}} 1 {{/U}} {{/U}}with six more hours of {{U}} {{U}} 2 {{/U}} {{/U}}time than usual. It's a child-care chasm that I usually end up crossing by building an emergency bridge made of cash: for more baby-sitting, more late {{U}} {{U}} 3 {{/U}} {{/U}}, more hastily put-together sort of activities. {{U}} {{U}} 4 {{/U}} {{/U}}no matter how unprepared I am, I'll never be arrested for my choices. That's what {{U}} {{U}} 5 {{/U}} {{/U}}to Deborah Harrell, who was taken into custody earlier this month, officially for unlawful conduct toward a child, also known as {{U}} {{U}} 6 {{/U}} {{/U}}her 9-year-old daughter in a park in North Augusta, S.C., for several hours {{U}} {{U}} 7 {{/U}} {{/U}}she was at work. Her kid had a cell phone, and the McDonald's Harrell works at was {{U}} {{U}} 8 {{/U}} {{/U}}, but the girl was there without adult {{U}} {{U}} 9 {{/U}} {{/U}}for much of the day, a {{U}} {{U}} 10 {{/U}} {{/U}}said. The mom's {{U}} {{U}} 11 {{/U}} {{/U}}led to a round of national hair pulling about "How a person could even do that" {{U}} {{U}} 12 {{/U}} {{/U}}"How a person could even report that". {{U}} {{U}} 13 {{/U}} {{/U}}, about 40% of parents leave their kids on their own, at least for a while, {{U}} {{U}} 14 {{/U}} {{/U}}the American Academy of Child and Adolescent Psychiatry. Three states have even {{U}} {{U}} 15 {{/U}} {{/U}}a minimum age for being home alone, {{U}} {{U}} 16 {{/U}} {{/U}}from 8 years old in Maryland to 14 in Illinois. Kids have raced around outside by themselves since the dawn of time. That's why those on the free-range end of the child-raising spectrum blamed the busybody who {{U}} {{U}} 17 {{/U}} {{/U}}Harrell. {{U}} {{U}} 18 {{/U}} {{/U}}she was doing exactly what child-protective-service agencies have asked U.S. citizens to do, especially since data {{U}} {{U}} 19 {{/U}} {{/U}}that child-abuse reports {{U}} {{U}} 20 {{/U}} {{/U}}to go down over summer but child-abuse incidents do not.

单选题{{B}}Text 1{{/B}} Menorca or Majorca? It is that time of the year again. The brochures are piling up in travel agents while newspapers and magazines bulge with advice about where to go. But the traditional packaged holiday, a British innovation that provided many timid natives with their first experience of warm sand, is not what it was. Indeed, the industry is anxiously awaiting a High Court ruling to find out exactly what it now is. Two things have changed the way Britons research and book their holidays: low-cost airlines and the internet. Instead of buying a ready made package consisting of a flight, hotel, car hire and assorted entertainment from a tour operator's brochure, it is now easy to put together a trip using an online travel agent like Expedia or Travelocity, which last July bought Lastminute. com for ￡577m (＄1 billion), or from the proliferating websites of airlines, hotels and car-rental firms. This has led some to sound the death knell for high street travel agents and tour operators. There have been upheavals and closures, but the traditional firms are starting to fight back, in part by moving more of their business online. First Choice Holidays, for instance, saw its pre tax profit rise by 16% to ￡114m ( ＄196m) in the year to the end of October. Although the overall number of holidays booked has fallen, the company is concentrating on more valuable long-haul and adventure trips. First Choice now sells more than half its trips directly, either via the internet, over the telephone or from its own travel shops. It wants that to reach 75% within a few years. Other tour operators are showing similar hustle. MyTravel managed to cut its loss by almost half in 2005. Thomas Cook and Thomson Holidays, now both German owned, are also bullish about the coming holiday season. Highstreet travel agents are having a tougher time, though, not least because many leading tour operations have cut the commissions they pay. Some high-street travel agents are also learning to live with the internet, helping people book complicated trips that they have researched online, providing advice and tacking on other services: This is seen as a growth area. But if an agent puts together separate flights and hotel accommodation, is that a package, too? The Civil Aviation Authority (CAA) says it is and the agent should hold an Air Travel Organisers- Licence, which provides financial guarantees to repatriate people and provide refunds. The scheme dates from the early 1970s, when some large British travel firms went bust, stranding customers on the Costas. Although such failures are less common these days, the CAA had to help out some 30,000 people last year. The Association of British Travel Agents went to the High Court in November to argue such bookings are not traditional packages and so do not require agents to acquire the costly licences. While the court decides, millions of Britons will happily click away buying online holidays, unaware of the difference.