单选题Common-cold Sense You can't beat it, but you don't have to join it. Maybe it got the name "common cold" because it's more common in winter. The fact is, though, being cold doesn't have anything to do with getting one. Colds are caused by the spread of rhinoviruses, and, at least so far, medical science is better at telling you how to avoid getting one than how to get rid of one. Children are the most common way cold viruses are spread to adults, because they have more colds than adults—an average of about eight per year. Why do kids seem so much more easily to get colds than their parents? Simple. They haven't had the opportunity to become immune to many cold viruses. There are more than 150 different cold viruses, and you never have the same one twice. Being infected by one makes you immune to it—but only it. Colds are usually spread by direct contact, not sneezing or coughing. From another person's hand to your hand and then to your nose or eyes is the most common route. The highest concentration of cold viruses anywhere is found under the thumbnails of a boy, although the viruses can survive for hours on skin or other smooth surfaces. Hygiene is your best defense. Wash your hands frequently, preferably with a disinfectant soap, especially when children in your household have colds. But even careful hygiene won't ward off every cold. So, what works when a coughing, sneezing, runny nose strikes? The old prescription of two aspirins, lots of water, and bed rest is a good place to start. But you'll also find some of the folk remedies worth trying. Hot mixtures of sugar(or honey), lemon, and water have real benefits.

单选题His heart gave a sudden Uleap/U when he saw her.

单选题The curious look from the strangers around her made her feel uneasy .

单选题He purchased a ticket and went up on the top deck.

单选题Broadband Broadband technology is seen as the key to the new digital economy. In this rapidly changing world, media and technology information can be sent via phone calls and downloads like music, graphics, business information or films. The simpler the information, the smaller the package and the narrower the bandwidth needed to deliver it. Broadband is used for high speed Internet connections at a fixed monthly rate. It turns an exciting telephone line into a high speed digital line capable of carrying data up to 40 times conventional modem speeds. Any download is available at the click of a mouse, there is no dial-up as there is with standard Internet Service Providers. For home owners and families there are many advantages. One of the most important is simultaneous access to both telephone lines and the Internet. No queues and no delay. For businesses, broadband can improve customer relations and provide direct access to corporate e-malls and databases. Entire operations can go online.

单选题The two banks have announced plans to merge next year.

单选题The Ideal Husband Science now might be able to explain women's fascination with Brad Pitt's face and George Clooney's eyes. Women seem to (51) potential mate by how masculine their features are, new research shows. Men with square jaws and well-defined brow ridges are seen as good short-term partners, (52) those with more feminine traits such as a rounder face and fuller lips are perceived as better long-term mates. In the study by Daniel Kruger at the US's University of Michigan, 854 subjects viewed a series of (53) head shots that had been digitally changed to exaggerate or minimize masculine traits. They then (54) questions about how they expected the men in the photos to behave. Most participants said that those with more masculine features were (55) to be risky, competitive, and more apt to fight, challenge bosses, cheat on spouses and put less effort into parenting. Those with more feminine (56) were seen as good parents and husbands, hard workers and emotionally supportive mates. But, despite all the negative characteristics, when asked who they would choose for a short-term relationship, women selected the more masculine (57) men. Brad and George, both chiseled jaws and well-defined brows, then would be good for a (58) romance, not for something longer. The study was published in the December issue of the US journal Personal Relationships. Kruger said that from an evolutionary perspective, this (59) sense. The key is testosterone, the hormone responsible (60) the development of masculine facial features and other sexual characteristics. It has been found to affect the body's ability to fight disease: men with high levels of the hormone are typically (61) and healthy- traits women want to pass on to their children. However, increased testosterone has also been linked to (62) and violence in relationships. So, these men (63) produce high quality offspring, but they don't always make great parents or faithful mates, Kruger says. The scientific community have (64) skepticism toward physiognomy, which links facial characteristics to certain behavioral traits. But Kruger argues that the research is a valuable tool for understanding mating strategies. And, of course, for explaining why Tony Leung and Takeshi Kanesshiro have millions of female (65) . It might have to do with their genes. Or something to do with ours.

单选题Taking a Nap During the Day Medical experts say most Americans do not get (51) sleep. They say more Americans need to rest for a short period in the middle of the day. They are advising people to sleep lightly before (52) with other activities. One study earlier this year found that persons who sleep for a few minutes during the day were less (53) to die of disease. The study followed more than 2,300 Greek adults (54) about six years. Adult who rested for half an hour (55) three times a week had a 37 percent lower risk of dying from heart disease than those who did not nap. Study organizers said the strongest evidence was in working men. They said naps might improve (56) by mitigating tension caused by work. Some European and Latin American businesses have supported the (57) of napping for many years. They urge people to (58) work, go home and have a nap before returning. In the United States, some companies let workers rest briefly in their offices. They believe this reduces in their offices. They believe this reduces (59) and accidents, and (60) increases the amount of work a person can do. Sleep experts say it is likely that people make more mistakes at work than at other times. They say people should not carry out important duties when they feel (61) . And they say the best thing to do is to take a nap. About twenty minutes of rest is (62) you need. Experts say this provides extra energy and can increase your effectiveness (63) the end of the day. But experts warn that a nap (64) last no more than twenty to thirty minutes. A longer nap will put the body into deep sleep and waking up will be (65) .

单选题{{B}}第三篇{{/B}} Plants in Desert Only special plants can survive in the terrible climate of a desert, for these are regions where the annual range of the soil temperature can be over 75℃. Furthermore, during the summer there are few clouds in the sky to protect plants from the sun's ray. Another problem is the fact that there are frequently strong winds which drive small-sharp particles of sand into the plants, tearing and damaging them. The most difficult problem for all forms of plant life, however, is the fact that the entire annual rainfall occurs during a few days or weeks in spring. Crasses and flowers in desert survive from one year to the next by existing through the long, hot, dry season in the form of seeds. These seeds remain inactive unless the right amount of rain falls. If no rain falls, or if insufficient rain falls, they wait until the next year, or even still the next. Another factor that helps these plants to survive is the fact that their life cycles are short. By the time that the water from the spring rains disappears--just a few weeks after it falls--such plants no longer need any. The perennials(多年生植物)have special features which enable them to survive as plants for several years. Thus, nearly all desert perennials have extensive root systems below ground and a small Shoot system above ground. The large root network enables the plant to absorb as much water as possible in a short time. The small shoot system, on the other hand, considerably limits water loss by evaporation (蒸发)。 Another feature of many desert perennials is that after the rainy season they lose their leaves in preparation for the long, dry season, just as trees in wetter climates lose theirs in preparation for the winter. This reduces their water loss by evaporation during the dry season. Then, in the next rainy season, they come fully alive once more, and grow new branches, leaves and flowers, just as the grasses and flowers in desert do.

单选题His shoes were shined to perfection.

单选题Scientists Develop Ways of Detecting Heart Attack German researchers have (51) a new generation of defibrillators and early-warning software aimed at offering heart patients greater protection (52) sudden death from cardiac arrest. In Germany alone around 100,000 people die annually as a result of cardiac arrest and many of these cases (53) by disruption to the heart's rhythm. Those most at risk are patients who have (54) suffered a heart attack, and for years the use of defibrillators has proved useful in intervening within seconds. These devices (56) a range of functions, such as that of pacemaker. Heart specialists at Freiburg's University Clinic have now achieved a breakthrough with an implanted defibrillator (57) of generating a six-channel electrocardiogram (ECG) within the body. This integrated system allows early diagnosis of (58) blood-flow problems and a pending heart attack. It will be implanted in patients for the first time this year. Meanwhile, researchers at the Fraunhofer Institute for Applied Mathematics in Kaiserslautern have developed new computer software that renders of ECG data (59) The overwhelming (60) of patients at risk will not have an implanted defibrillator and must for this reason undergo regular ECGs. "Many of the current programs only (61) into account a linear correlation of the data. We are, however, making use (62) a non-linear process that reveals the chaotic patterns of heart beats as an open and complex system," Hagen Knaf says, " (63) changes in the heart beats over time can be monitored and individual variations in patients taken into account. " An old study of ECG data, based (64) 600 patients who had suffered a subsequent heart attack, enabled the researchers to compare risks and to show (65) the new software evaluates the data considerably better.

单选题It"s prudent to take a thick coat in cold weather when you go out.

单选题Theodere Dreiser was one of the first American novelists to portray immoral characters without condemnation. A. hostility B. sadness C. blame D. pity

单选题We are restricted to a speed of 30 miles an hour in built-up areas.

单选题Blend together the eggs, sugar and flour.

单选题Two events have highlighted the tensions in recent years.

单选题The body snatchers used wooden shovels because

单选题She was a {{U}}puzzle. {{/U}}

单选题Major manufacturers have been using "quality circle" with undeniable success for more them two {{U}}decades{{/U}}.

单选题He {{U}}inquired{{/U}} whether it was possible to leave his suitcase at the railway station.