单选题Her display of bad temper completely ruined the party.

单选题A lot of people could fall ill after drinking contaminated water.

单选题My grandfather would sit for hours Uon end/U staring out of the window at the mountains.

单选题We"ve been through some rough times together.

单选题Laser beams can be used to bore metals and other hard materials.

单选题第二篇 The Book of Life So far, scientists have named about 1.8 million living species (物种), and that's just a small part of what probably exists on Earth. With so many plants, animals, and other creatures covering the planet, it can be tough to figure out what type of spider is moving up your leg or what kind of bird is flying by. A soon-to-be-launched Web site might help. An international team of researchers has announced the creation of a Web-based Encyclopedia (百科全书) of Life (EoL). The project aims to catalog every species on Earth in a single, easy-to-use reference guide. To get the encyclopedia started, the creators will use information from scientific databases (数据库) that already exist. And eventually, in special sections of the site, non-scientists with specialized (专门的) knowledge will get to join in. Bird-watchers, for example, will be able to input which birds they've seen and where. The technology for this kind of tool has only recently become available. As the EoL develops, you might find it useful for school projects. The site will feature special pages for kids who are studying ecosystems (生态系统) in their neighborhoods. To make sure the encyclopedia is accurate, scientists will review much of the information added to it. People who visit the site will be able to choose to leave out pages that haven't been reviewed. Another convenient feature of the EoL is that you'll be able to pick the level of detail you see to match your interests, age, and current knowledge. If you wanted to learn about bears for a science class report, for example, you could use the "novice" setting to get basic information about the animals. On the "expert" setting, on the other hand, you could get much more detailed information about the history, literature, and exploration of bears. It now takes years for scientists to collect all the data they need to describe and analyze species. The creators of the Encyclopedia of Life hope that their new tool will speed that process.

单选题She always finds fault with everything.

单选题 下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。{{B}}第一篇{{/B}} {{B}}Attitudes to AIDS Now{{/B}} Most people say that the USA is making progress in fighting AIDS, but they don't know there'sno cure and strongly disagree that "the AIDS epidemic is over," a new survey finds. The findings, released Thursday by the Kaiser Family Foundation, reassure activists who have worded that public concern about AIDS might disappear in light of recent news about advances in treatment and declines in deaths. "While people are very optimistic about the advances, they're still realistic about the fact that there is no cure." says Sophia Chang, director of HIV programs at the foundation. The Kaiser survey, like a recent USA TODAY Gallup Poll, does find that the number of people ranking A1DS as the country's top health problem has fallen. In the Kaiser Poll, 38% say it's the top concern, down from 44% in a 1996 poll; in the Gallup Poll, 29% say AIDS is No.1, down from 41% in 1992 and 67% in 1987. Other findings from Kaiser, which polled more than 1,200 adults in September and October and asked additional questions of another 1,000 adults in November: 52% say the country is making progress against AIDS, up from 32% in 1995. 51% say the government spends too little on AIDS. 86% correctly say AIDS drugs can now lengthen lives; an equal number correctly say that the drugs are not cures.67% incorrectly say that AIDS deaths increased or stayed the same in the past year; 24% know deaths fell. Daniel Zingale, director of AIDS Action Council, says, "I'm encouraged that the American people are getting the message that the AIDS epidemic isn't over. I hope tho decision-makers in Washington are getting the same message ..." We have seen signs of complacency.

单选题The Japanese worker is fond of his company's products because of

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 {{B}}Animals in the Desert{{/B}} Some desert animals can survive the very strong summer heat and dryness because they have very unusual characters. The camel, for example, can{{U}} (51) {{/U}}an increase in the temperature of its body and its blood of 9℃. In addition, it can drink an enormous amount of water at one time, then store sufficient water in its red blood cells and other parts of its body to supply its needs for two weeks or more. The kangaroo rat (长鼻袋鼠) ,on the other hand,{{U}} (52) {{/U}}all the water it needs from water that it produces during respiration (呼吸). However, most animals need to{{U}} (53) {{/U}}a fairly constant body temperature, and will die if it rises more than 5℃. {{U}}(54) {{/U}},they need to find some way to avoid the strong sun rays. Nor can many animals either store or produce water in their bodies, as the camel and kangaroo rat can. So they must find ways to{{U}} (55) {{/U}}water loss from their bodies to the lowest degree. Because very few desert animals can survive the strong rays, the temperature, and the evaporation(蒸发) rate{{U}} (56) {{/U}}a typical summer's day, most of them are{{U}} (57) {{/U}}during the night. Only after the sun has set does the desert come fully to life; The night is{{U}} (58) {{/U}}cool, and the darkness provides{{U}} (59) {{/U}},not only from the sun, but also from other animals and from the birds. So the coming of darkness is the signal{{U}} (60) {{/U}}the large majority of animals and insects (昆虫) to continue their search for water and food. When morning comes, most of them seek shelter again: many go underground; nearly all find{{U}} (61) {{/U}}shady and they can avoid the sun rays there. For many kinds of insects, living in the desert is{{U}} (62) {{/U}}than for animals. Like many desert plants, they have a waterproof skin which{{U}} (63) {{/U}}water loss by evaporation. In addition, some insects spend all or most of their life below ground. Here, for most of the year at least, there is{{U}} (64) {{/U}}wetness, and it is generally cooler than on the{{U}} (65) {{/U}}.

单选题{{B}}第二篇{{/B}} Listening Device Provides Landslide(山崩；地滑；塌方)Early Warning A device that provides early warning of a landslide by monitoring vibrations (振动)in soil is being tested by UK researchers. The device could save thousands of lives each year by warning when an area should be evacuated(疏散，撤走), the scientists say. Such natural disasters are common in countries that experience sudden, heavy rainfall(降雨，降雨量), and can also be triggered by earthquakes and even water erosion(腐蚀，侵蚀). Landslides start when a few particles of soil or rock within a slope start to move, but the early stages can be hard to spot. Following this initial movement, "slopes can become unstable in a matter of hours or minutes, " says Nell Dixon at Southborough University, UK. He says a warning system that monitors this movement "might be enough to evacuate a block of fiats or clear a road, and save lives. " The most common way to monitor a slope for signs of an imminent (即将发生的) landslide is to watch for changes in its shape. Surveyors can do this by measuring aside directly, or sensors(传感器) sunk into boreholes(钻孔，井眼)or fixed above ground can be used to monitor the shape of a slope. Slopes can, however, change shape without triggering a landslide, so either method is prone to causing false alarms. Now Dixon's team has developed a device that listens for the vibrations' caused when particles begin moving within a slope. The device takes the form of a steel pipe dropped into a borehole in a slope. The borehole is filled in with gravel(砾，沙砾，砾石)around the pipe to help transmit high-frequency vibrations generated by particles within the slope. These vibrations pass up the tube and are picked up by a sensor on the surface. Software analyses the vibration signal to determine whether a landslide may be imminent. The device is currently being tested in a 6-metre-tall artificial clay embankment(堤岸)in Newcastle, UK. Early results suggest it should provide fewer false positives than existing systems. Once it has been carefully and thoroughly tested, the device could be used to create a complete early-warning system for dangerous slopes. "Locations with a significant risk of landslides could definitely benefit from a machine like this, " says Adam Poulter, an expert at the British Red Cross. "As long as it doesn't cost too much, " But, Poulter adds that an early-warning system may not he enough on its own. "You need to have the human communication, " he says. "Making systems that get warnings to those who need them can be difficult. "

单选题The repair work involved Umodifying/U two of the windows.

单选题Animal Testing Controversy To paraphrase 18thcentury statesman Edmund Burke, "all that is needed for the triumph of a misguided cause is that good people do nothing. " One such cause now seeks to end biomedical research because of the theory that animals have rights ruling out their use in research. Scientists need to respond forcefully to animal rights advocates, whose arguments are confusing the public and thereby threatening advances in health knowledge and care. Leaders of the animal rights movement target biomedical research because it depends on public funding, and few people understand the process of health care research. Hearing allegations of cruelty to animals in research settings, many are perplexed that anyone would deliberately harm an animal. For example, a grandmotherly woman staffing an animal rights booth at a recent street fair was distributing a brochure that encouraged readers not to use anything that comes from or is animals-no meat, no fur, no medicines, Asked if she opposed immunizations, she wanted to know if vaccines come from animal research. When assured that they do, she replied, "Then I would have to say yes. " Asked what will happen when epidemics return, she said, "Don't worry, scientists will find some way of using computers. " Such well-meaning people just don't understand. Scientists must communicate their message to the public in a compassionate, understandable way-in human terms, not in the language of molecular biology. We need to make clear the connection between animal research and a grandmother's hip replacement, a father's bypass operation, a baby's vaccinations, and even a pet's shots. To those who are unaware that animal research was needed to produce these treatments, as well as new treatments and vaccines, animal research seems wasteful at best and cruel at worst. Much can be done. Scientists could "adopt" middle school classes and present their own research. They should be quick to respond to letters to the editor, lest animal rights misinformation go unchallenged and acquire a deceptive appearance of truth. Research institutions could be opened to tours, to show that laboratory animals receive humane care. Finally, because the ultimate stakeholders are patients, the health research community should actively recruit to its cause not only well-known personalities such as Stephen Cooper, who has made courageous statements about the value of animal research, but all who receive medical treatment. If good people do nothing there is a real possibility that an uninformed citizenry will extinguish the precious embers of medical progress.

单选题The old concerns lose importance and some of them {{U}}vanish{{/U}} altogether.

单选题I wanted to ask her out but was scared that she might refuse.A. afraidB. anxiousC. sureD. sad

单选题Almost all economists agree that nations gain by trading with one another.

单选题Loud noises can be{{U}} irritating{{/U}}．

单选题His life is like a myth .

单选题 Language Learning It is, everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in so short a period of time challenges explanation. Language learning begins with listening. Individual children vary greatly in the amount of listening they do before they start speaking, and late starters are often long listeners. Most children will "obey" spoken instructions some time before they can speak, though the word obey is hardly accurate as a description of the eager and delighted cooperation usually shown by the child. Before they can speak, many children will also ask questions by gesture and by making questioning noises. Any attempt to trace the development from the noises babies make to their first spoken words leads to considerable difficulties. It is agreed that they enjoy making noises, and that during the first few months one or two noises sort themselves out as particularly indicative of delight, distress, sociability, and so on. But since these cannot be said to show the baby's intention to communicate, they can hardly be regarded as early forms of language. It is agreed, too, that from about three months they play with sounds for enjoyment, and that by six months they are able to add new sounds to their repertoire (能发出的全部声音). This self-imitation leads on to deliberate (有意识的) imitation of sounds made or words spoken to them by other people. The problem then arises as to the point at which one can say that these imitations can be considered as speech.

单选题In order to {{U}}survive{{/U}} man needs to consume food and water. A. work B. play C. live D. walk