单选题All the people gathered at Mary's house.A. collectedB. fixedC. dividedD. assist

单选题The nursery is bright and cheerful.

单选题Racial Prejudice In some countries where racial prejucide is acute, violence has been taken for granted as a means of solving differences; and this is not even questioned. There are countries 1 the white man imposes his rude by brute (粗暴) force; there are countries where the black man protests by 2 fire to cities and by looting and pillaging (抢夺). Important people on both sides, who would in other respects appear to be reasonable men, get up and calmly argue in 3 of violence as if it were a legitimate (合法的) solution, 4 any other. What is really frightening, what really 5 you with despair, is the realization that when it comes to the crunch (关键时刻), we have made no actual 6 at all. We may wear collars and ties instead of war-paint, but our instincts remain basically unchanged. The whole of the recorded 7 of the human race, that tedious documentation of violence, has taught us absolutely nothing. We have still not learnt that 8 never solves a problem but makes it more acute. The sheer horror, the bloodshed and the suffering 9 nothing. No solution ever comes to 10 the morning after when we dismally (阴郁地) contemplate the smoking ruins and wonder what hit us. The truly reasonable men who 11 where the solutions lie are finding it harder and harder to get a hearing. They are despised, mistrusted and even persecuted 12 their own kind because they advocate such apparently outrageous things as low enforcement. If half the energy that goes into 13 acts were put to good use, if our efforts were directed at 14 up the slums and ghettos (贫民窟), at improving living-standards and providing education and employment for all, we would not have gone a long way to 15 at a solution.

单选题The boys were {{U}}charmed{{/U}} by the sailor's tales of adventure.

单选题Rising College Selectivity Rising college selectivity doesn"t mean that students are smarter and more serious than in the past, although a few clearly are. It"s a function of excess demand for higher education, occurring at a time of increased financial privatization of the industry. The recession has only increased demand. The vast majority of students aren"t going to college because of a thirst for knowledge, or even for the cultural and social adventure they hope to have. They"re there because they need a job, and they need to get the credentials—and, one hopes, the knowledge and skills behind the credentials—that will get them into the labor market. As higher education has become a seller"s market, the institutions in a position to do so are doing what comes naturally: raising their tuitions and their admissions requirements, but at the expense of contributing to the national goal to increase college attainment. The result is that the United States is losing ground in the international race for educational talent, because although we have some of the best institutions in the world, the whole is less than the sum of its parts. The increasing stratification of higher education is happening on the spending side, as well. As the selective institutions have become more expensive and less attainable, the rest have had to struggle with the responsibility to enroll more students without being paid to do so. Gaps between rich and poor have grown even more dramatically than gaps in entering test scores. While spending is a poor measure of educational quality, we can"t seriously expect to increase educational attainment if we"re not prepared to do something to address these growing inequities in funding. That said, the educational policy problem in our country is not that the elite institutions are becoming more selective. They are what they are, and they"re getting more like themselves all the time. The problem is on the public policy side. The president and many governors have set a goal to return America to a position of international leadership in educational attainment. It"s the right goal, we just need a financing strategy to get there. That doesn"t mean just more money, although some more money will be needed. It also means better attention to effectiveness and to efficiency, and to making sure that spending goes to the places that will make a difference in educational attainment. We know how to do it, if we want to.

单选题The mountains look glorious at sunrise.

单选题He is hopeful about his chances of winning a gold medal in the Olympics next year.

单选题Ford"s Assembly Line When it comes to singling out those who have made a difference in all our lives, you cannot overlook Henry Ford. A historian a century from now might well conclude that it was Ford who most influenced all manufacturing, everywhere, even to this day, by introducing a new way to make cars—one, strange to say, that originated in slaughterhouses (屠宰场). Back in the early 1900s, slaughterhouses used what could have been called a "disassembly line". Ford reversed this process to see if it would speed up production of a part of an automobile engine called a magneto. Rather than have each worker completely assemble a magneto, one of its elements was placed on a conveyor, and each worker, as it passed, added another component to it, the same one each time. Professor David Hounshell of the University of Delaware, an expert on industrial development, tells what happened. "The previous day, workers carrying out the entire process had averaged one assembly every 20 minutes. But on that day, on the line, the assembly team averaged one every 13 minutes and 10 seconds per person." Within a year, the time had been reduced to five minutes. In 1913, Ford went all the way. Hooked together by ropes, partially assembled vehicles were towed (拖、拉) past workers who completed them one piece at a time. It hasn"t been long before Ford was turning out several hundred and thousand cars a year, a remarkable achievement then. And so efficient and economical was this new system that he cut the price of his cars in half, to $260, putting them within reach of all those who, up until that time, could not afford them. Soon, auto makers and the world all copied him. In fact, he encouraged them to do so by writing a book about all of his innovations, entitled Today and Tomorrow . The Age of the Automobile has arrived. Today, aided by robots and other forms of automation (自动化), everything from toasters to perfumes is made on assembly lines.

单选题7 The world champion suffered a {{U}}sensational{{/U}} defeat.

单选题Communication satellites generally use solar cells as their source of electric power, although some test satellites have used thermoelectric generators. A．superior B．authorized C．former D．experimental

单选题I think I managed to grasp the main points of the lecture.

单选题In the background was that eternal hum.

单选题Screen Test Every year millions of women are screened with X-rays to pick up signs of breast cancer. If this happens early enough, the disease can often be treated 1 . According to a survey published last year, 21 countries have screening programmes. Nine of them, including Australia, Canada, the U. S. and Spain, 2 women under 50. But the medical benefits of screening these younger 3 are controversial, partly because the radiation brings a small risk of inducing cancer. 4 , younger women must be given higher doses of X-rays because their breast tissue is denser. Researchers at the Polytechnic University of Valencia analyzed the effect 5 screening more than 160,000 women at 11 local clinics. After estimating the women"s cumulative dose of radiation, they used two models to calculate the number of extra cancers this 6 cause. The mathematical model recommended by Britain"s National Radiological Protection Board (NRPB) predicted that the screening programme would 7 36 cancers per 100,000 women, 18 of them fatal. The model preferred by the UN Scientific Committee on the Effects of Atomic Radiation 8 a lower figure of 20 cancers. The researchers argue that the level of radiation-induced cancers is "not very significant" 9 to the far larger number of cancers that are discovered and treated. The Valencia programme, they say, detects between 300 and 450 10 of breast cancer in every 100,000 women screened. But they 11 that the risk of women contracting cancer from radiation could be reduced by between 40 and 80 percent if screening began at 50 instead of 45, because they would be exposed to 12 radiation. The results of their study, they suggest, could help "optimise the technique" for breast cancer screening. " 13 is a trade-off between the diagnostic benefits of breast screening and its risks," admits Michael Clark of the NRPB. But he warns that the study should be interpreted with caution. "On the 14 of the current data, for every 10 cancers successfully detected and prevented there is a risk of 15 one later in life. That"s why radiation exposure should be minimised in any screening programme.

单选题Home Fibre Plans Survive Downturn The latest figures on superfast broadband delivered by fibre to the home (FTFH) shows 18% growth over the last survey compiled in late 2008. The continued growth suggests that the global economic downturn has not hit plans to build a fibre infrastructure. Sweden tops the list of nations roiling out the technology, with 10.9% of its broadband customers using fibre. Karel Helsen, president of Europe's Fibre -To- The- Home Council, said the growth matched predictions that were revised when the credit crunch started to make itself felt. By 2012. the FTTH Council expects that 13 million people across 35 European nations will have their broadband delivered by fibre. Such services would start at speeds of 100 megabits per second (mbps) , said Mr. Helsen. Around Europe more than 233 projects were underway to lay the fibre that would connect homes or buildings to the net, said Mr. Helsen. Many of those, he said, were being operated by local governments or smaller net firms. They were interested in FTTH because of the economic and social benefits it brought, said Mr. Helsen. The low delay in data transfer in high - speed fibre networks made possible novel uses of broadband ,he said. "No delay is very important," he said," specifically if you talk about applications that are time dependent such as personal communications, conference calls or video calls where delays cause a lot of interference. " While early FTTH services were concentrated in cities, said Mr Helsen, many more were reaching out to rural areas for e - health and e - learning projects. Separate studies show that an FTTH infrastructure can have a direct impact on local economic output, said Mr Helsen. The UK, France and Germany have yet to break into the list of top ten FTTH nations.

单选题Although there are many predictions about the future, no one knows for sure ______ the world would be like in 50 years.A. howB. thatC. whichD. what

单选题Techniques to harness the energy of the sun are being developed.

单选题Making Light of Sleep All we have a clock located inside our brains. Similar to your bedside alarm clock, your internal clock runs on a 24-hour cycle. This cycle, called a circadian rhythm, helps control when you wake, when you eat and when you steep. Somewhere around puberty, something happens in the timing of the biological clock. The clock pushes forward, so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it"s time for bed, your body may be pushing you to stay up for several hours more. And the light coming from your computer screen or TV could be pushing you to stay up even later. This shift is natural for teenagers. But staying up very late and sleeping late can get your body"s clock out of sync with the cycle of light and dark. It can also make it hard to get out of bed in the morning and may bring other problems, too. Teenagers are put in a kind of a gray cloud when they don"t get enough sleep, says Mary Carskadon, a sleep researcher at Brown University in Providence, RI. It affects their mood and their ability to think and learn. But just like your alarm clock, your internal clock can be reset. In fact, it automatically resets itself every day. How? By using the light it gets through your eyes. Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks. For years, researchers thought that the signals that synchronize the body"s clock were handled through the same pathways that we use to see. But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether it"s day or night.

单选题Before the development of movable metal type in the mid-fifteenth century, news was {{U}}disseminated{{/U}} by word of mouth, by letter, or by public notice.

单选题Although research has shown that asparagus does contain many important nutrients, it is not, as it was once regarded, a panacea.

单选题Even in a highly modernized country, {{U}}manual{{/U}} work is still needed. A. expressive B. physical C. exaggerated D. dubious