单选题Though he was born in America ,he can speak smooth Chinese.A. perfectB. fluentC. poorD. flowing

单选题The children trembled with fear when they saw the policeman.

单选题Lonely Planet Sometimes it seems like we're all friends on Facebook. But the sad truth is that Americans are lonelier than ever. Between 1985 and 2004, the number of people who said they felt lonely tripled, to 25 percent, according to Duke University researchers. Social isolation in all adults has been linked to sleep disorders, high blood pressure, and an increased risk of depression and suicide, says John T. Cacioppo, a neuroscientist at the University of Chicago. Though more Americans than ever are living alone, the connection between single -living and loneliness is in fact quite weak. "Some of the most profound loneliness can happen when other people are present," says Harry Reis, professor of psychology at the University of Rochester. Take college freshmen: even though they're surrounded by people almost all the time, many feel incredibly isolated during the first quarter of the school year, Cacioppo says. By the second quarter, however, most freshmen have found social replacements for their high - school friends. So how many friends do you need to avoid loneliness? There is no magic number. An introvert might need one confidante not to feel lonely, whereas an extrovert might require three, or four bosom buddies. Experts say it's not the quantity of social relationships but the quality that really matters. "The most popular kid in school may still feel lonely," Cacioppo says. "There ore a lot of stars who have been idols and lived lonely lives. " Loneliness can be relative: it has been defined as an emotional response to a perceived discrepancy between a person's desired levels of social interaction and the contact they're actually receiving. People tend to measure themselves against others, feeling particularly alone in communities where social connection is the norm. Social- networking sites like Facebook and My Space may provide people with a false sense of connection that ultimately increases loneliness in people who feel alone. "These sites should serve as a supplement, but not replacement for, face - to - face interaction. Just being able to engage genuinely and politely with your neighbors is a better fix than texting could ever effect for mental stability. " Cacioppo says.

单选题Her comments about men are Uutterly/U ridiculous.

单选题It is strictly {{U}}prohibited{{/U}} that access to confidential documents is denied to all but a few. A. secured B. forbidden C. regulated D. determined

单选题I was shocked when I saw the size of the telephone bill.A. surprisedB. lostC. excitedD. angry

单选题I am not certain whether he will come.

单选题Mozart showed a particular aptitude for music when he was young. A talent B. fondness C. affection D. passion

单选题An {{U}}exhaustive{{/U}} investigation of the facts proves the contrary.

单选题The song "Yankee Doodle" was originally sung by British troops to ridicule the American colonists. A．given inspiration to B．make fun of C．entertain D．discourage

单选题In Boulder, Colo. , a surge of electricity on the power grid can largely go unhoticed. The grid is monitored electronically, so that if there are any sudden rushes or fallen power lines, electricity is automatically rerouted(使改变路线) from one part of the system to another. This pilot project sounds simple enough—maybe even a little obvious. But this new type of technology could have prevented the 2003 blackout that knocked out power to much of the Northeastern United States. On that August day'a few sagging power lines brushed against some trees, and the lines shut down. This set off a domino effect, as ome part of the grid taxed another. The result? By the end of that humid evening, 50 million people in eight states and southeastern Canada were left without power. What will happen if there are fallen power lines in -,in electrically monitored grid?A. A blackout will follow.B. Electricity will transmit through another grid.C. The power failure will go almost unnoticed.D. Workers must go to site to restore electricity.

单选题Home Heating Central heating became popular only after the Civil War. Typically, coal-burning furnaces (火炉) fueled the early systems. Natural gas had developed into the leading fuel by 1960. Its acceptance resulted in part from its wide uses. Because it comes primarily from U.S. and Canadian fields, natural gas is also less vulnerable (脆弱的) than oil is to war. Oil remains the most important fuel in a few areas, such as New England. Electric heating dominates most areas with mild winters and cheap electricity, including the South and the Northwest. It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning. Bottled gas, which is somewhat more expensive than utility gas, is the fuel of choice in rural areas not served by utility pipelines. Wood is the leading heating fuel in just a few rural counties. Home heating, which accounts for less than 7 per cent of all energy consumed in the U.S., has had a commendable (值得赞扬的) efficiency record: from 1978 to 1997, the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size. The U.S. Department of Energy, however, forecasts that energy used in home heating will rise by 14 per cent over the next two decades. That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses. Natural gas and electricity will probably dominate the home heating market for the next two decades. Solar (太阳的) heating never became popular because of cost and limited winter sunlight in most areas; in 2000 only 47,000 homes relied on it,

单选题If he told his wife about their plan, she would surely agree with it.A. unnecessarilyB. simplyC. certainlyD. possibly

单选题Anderson left the table, remarking that he had some work to do.A. doubtingB. sayingC. thinkingD. knowing

单选题 Norwich Norwich, the capital of the part of Britain known as East Anglia, has been in existence for more than two thousand years. It began as a small village beside the River Wensum. At the time of the Norman invasion in 1066 it had grown to become one of the largest towns in England. With two cathedrals and a mosque (清真寺), Norwich has long been a popular centre for various religions. The first cathedral was built in 1095 and has recently celebrated its 900th anniversary, while Norwich itself had a year of celebration in 1994 to mark the 800th anniversary of the city receiving a Royal Charter. This allowed it to be called a city and to govern itself independently. Today, in comparison with places like London or Manchester, Norwich is quite small, with a population of around 150,000, but in the 16th century Norwich was the second largest city of England. It continued to grow for the next 300 years and got richer and richer, becoming famous for having as many churches as there are weeks in the year and as many pubs as there are days in the year. Nowadays, there are far fewer churches and pubs, but in 1964 the University of East Anglia was built in Norwich. With its fast-growing student population and its success as a modern commercial centre (Norwich is the biggest centre for insurance services outside London), the city now has a wide choice of entertainment: theatres, cinemas, nightclubs, busy cafes, excellent restaurants, and a number of arts and leisure centres. There is also a football team, whose colours are green and yellow. The team is known as "The Canaries (金丝雀)", though nobody can be sure why. Now the city's attractions include another important development, a modern shopping centre called "The Castle Mall". The people of Norwich lived with a very large hole in the middle of their city for over two years, as builders dug up the main car park. Lorries moved nearly a million tons of earth so that the roof of the Mall could become a city centre park, with attractive water pools and hundreds of trees. But the local people are really pleased that the old open market remains, right in the heart of the city and next to the new development. Both areas continue to do good business, proving that Norwich has managed to mix the best of the old and the new.

单选题In the 1870's Alexander Graham Bell developed the first {{U}}practicable{{/U}} telephone.

单选题He talks tough but has tender heart.

单选题American civil war Historians of the war can be divided into two schools. The first considers that it was the unavoidable outcome of conflicting (51) between Northern and Southern (52) . The second blames it (53) political leaders for (54) to avert an unnecessary war. Analysts are also divided on whether the issue of slavery was the primary cause of the war, or a symptom of other, more (55) differences—especially sectional interests and the doctrine of states' rights—between the North and South which had been developing since the formation of the American republic. The fundamental (56) was economic. In the early 1840s the Northern states began the process of industrialization, modernizing their society to meet the demands of economic change. In (57) , the slogan of Abraham Lincoln's Republican party, "free labour, free land, free man" encapsulated the ideology of valuing the freedom of individuals to grasp the (58) for economic self-advancement in a booming, expanding society. The Southern states remained stubbornly (59) both economically and socially. It was a backward-looking way of life of tall white mansions on great (60) dependent on a labour system which made slaves of approximately 4 million black Americans. America was (61) divided by economic structure, and was led into fratricidal(杀同胞的) warfare by a series of political clashes. The most common cause was the future of the West. The crises over California's admission in 1850 and over Kansas-Nebraska in 1854 were (62) of the divergent economic interests of North and South in relation to the West. The North wanted free land for independent labour in the same new territories where the South (63) to perpetuate its traditional way of life by extending slavery. The issue was not the slavery already practised, but the (64) of its extension (65) the West.

单选题Stress Level Tied to Education Level People with less education suffer fewer stressful days, according to a report in the current issue of the Journal of Health and Social Behavior. However, the study also found that when less-educated people did suffer stress it was more severe and had a larger impact on their health. From this, researchers have concluded that the day-to-day factors that cause stress are not random. where you are in society determines the kinds of problems that you have each day, and how well you will cope with them. The research team interviewed a national sample of 1,031 adults daily for eight days about their stress level and health. People without a high school diploma reported stress on 30 percent of the study days, people with a high school degree reported stress 38 percent of the time, and people with college degrees reported stress 44 percent of the time. "Less advantaged people are less healthy on a daily basis and are more likely to have downward turns in their health. "lead researcher Dr. Joseph Grzywacz, of Wake Forest University Baptist Medical Center, said in a prepared statement. "The downward turns in health were connected with daily stressors and the effect of daily stressors on their health is much more devastating for the less advantaged. " Grzywacz suggested follow-up research to determine why less-educated people report fewer days of stress when it is known their stress is more acute and chronic. "If something happens every day, maybe it's not seen as a stressor" Grzywacz says. "Maybe it is just life. /

单选题We cannot always Ucount on/U the wind, so new windmills should be so designed that they can also be driven by water.