单选题Techniques to{{U}} harness{{/U}} the energy of the sun are being developed.

单选题Public and Private Schools in the Unite States Religious and private schools receive little or no support from public taxes in the Unite States, and, as a result, are usually somewhat expensive to (51) . The largest group of religious schools in America (52) by the Roman Catholic Church. While religious schools tend to be (53) expensive than private schools, there are usually some fees. When there is free education available to all children in the Unite States, why do people (54) money on private schools? Americans offer (55) great variety of reasons for doing so, including the desire of some parents to (56) their children to schools (57) classes tend to be smaller, or where religious instruction is included as part of the educational program, or because, (58) their opinion, the public schools in their area are not (59) high enough quality to meet their needs. Private schools in the Unite States (60) widely in size, quality, and in the kind of program that are offered to meet (61) of certain students. The degree (62) American parents are active in their children's schools is often (63) to people of other countries. Most schools have organizations (64) of both parents and teachers, usually called P. T. A for Parent-Teacher-Association. They meet together to (65) various matters concerning the school. Parents often give their time to help with classroom or after school activities.

单选题He was one of the Uprincipal organizers/U of the association.

单选题Sometimes people try to circumnavigate the downtown traffic.

单选题About one million Americans are diagnosed annually with skin cancer.

单选题Eat Healthy "Clean your plate !" and "Be a member of the clean-plate club ! " Just about every kid in the US has heard this from a parent or grandparent. Often, it's accompanied by an appeal: "Just think about those starving orphans in Africa!" Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take too many bites. Instead of staying "clean the plate" , perhaps we should save some food for tomorrow. According to news reports, US restaurants are partly to blame for the growing bellies. A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They prefer to have customers complain about too much food rather than too little. Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand. Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this too. The restaurant industry trade magazine QSR reported last month that 57 percent of more than 4,000 people surveyed believe restaurants serve portions that are too large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many Americans who can't afford fine dining still prefer large portions. Seventy percent of those earning at least $150,000 per year prefer smaller portions; but only 45 percent of those earning less than $25,000 want smaller. It's not that working class Americans don't want to eat healthy. It's just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year's Christmas presents.

单选题Features such as height, weight, and skin color {{U}}differ{{/U}} from individual to individual and from face to face。

单选题Cultural Differences People from different cultures sometimes do things that make each other uncomfortable, sometimes without realizing it. Most Americans have 1 been out of the country and have very 2 experience with foreigners. But they are usually spontaneous (由衷的), friendly and open, and enjoy 3 new people, having guests and bringing people together formally or informally. They tend to use first names 4 most situations and speak freely about themselves. So if your American hosts do something that 5 you uncomfortable, try to let them know how you feel. Most people will 6 your honesty and try not to make you uncomfortable again. And you"ll all 7 something about another culture! Many travelers find 8 easier to meet people in the US than in other countries. They may just come up and introduce themselves or even invite you over 9 they really know you. Sometimes Americans are said to be superficially (表面上) 10 . Perhaps it seems so, but they are probably just having a good time. Just like anywhere else, it 11 time to become real friends 12 people in the US. If and when you 13 with American friends, they will probably 14 introducing you to their friends and family, and if they seem proud to 15 you, it"s probably because they are. Relax and enjoy it!

单选题Put a lid on the pan so the food will stay hot.A. remainB. becomeC. cookD. turn

单选题The biggest problem with the U. S. health - care system is that it has long been designed to respond to illness rather than prevent it. According to an analysis by the Common wealth Fund, a foundation that funds health - care research, half of American adults in 2005 did not receive recommended preventive care, which includes vaccinations, cancer screenings and blood -pressure checks. When we do get our cardiac health checked, too often it's because we've been rushed to the emergency room suffering from chest pains. When we do get a cancer evaluation, too often it's a diagnosis of advanced disease that has spread beyond the initial tumor site. What will probably happen under the present US health -care system?A. All Americans do not receive preventive care.B. Many Americans seek medical help when it is too late.C. Everyone who is sick will receive medical help.D. Americans do not receive medial help even when they are sick.

单选题Play Play is the principal business of childhood, and in recent years research has shown the great importance of play in the development of a human being. From earliest infancy, every child needs opportunity and the right materials for play, and the main tools of play are toys. Their main function is to suggest, encourage and assist play. To succeed in this they must be good toys, which children will play with often, and will come back to again and again. Therefore it is important to choose suitable toys for different stages of a child"s development. In recent years research on infant development has shown that the standard a child is likely to reach, within the range of his inherited abilities, is largely determined in the first three years of his life. So a baby"s ability to profit from the right play materials should not be underestimated. A baby who is encouraged and stimulated, talked to and shown things and played with, has the best chance of growing up successfully. In the next stage, from three to five years old, curiosity knows no bounds. Every type of suitable toy should be made available to the child, for trying out, experimenting and learning, for discovering his own particular ability. Bricks and jigsaws (七巧板) and construction toys; painting, scribbling (涂鸦) and making things; sand and water play; toys for imaginative and pretending play; the first social games for learning to play and get on with others. But the third stage of play development—from five to seven or eight years—the child is at school. But for a few more years play is still the best way of learning, at home or at school. It is easier to see which type of toys the child most enjoys. Until the age of seven or eight, play and work mean much the same to a child. But once reading has been mastered, then books and school become the main source of learning. Toys are still interesting and valuable, they lead on to new hobbies, but their significance has changed—to a child of nine or ten years, toys and games mean, as to adults, relaxation and fun.

单选题She had sworn to {{U}}uphold{{/U}} the policy.

单选题The last two paragraphs illustrate that taste acuity is

单选题He seemed reluctant to help us.A. gladB. tiredC. unwillingD. pleased

单选题She was {{U}}shocked{{/U}} by the strange noises.

单选题About one {{U}}quarter{{/U}} of the workers in the country are employed in factories.

单选题Irish Dolphins may Have a Unique Dialect Irish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other. The Shannon Dolphin and Wildlife Foundation (SDWF) has been studying a group of up to 120 bottle-nose dolphins in the River Shannon using vocalizations collected on a computer in a cow shed near the River Shannon. As part of a research project, student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated them into six fundamental whistle types and 32 different categories. Of the categories, he found most were used by both sets of dolphins but eight were only heard from the Irish dolphins. "We are building up a catalogue of the different whistle types they use and trying to associate them with behavior like foraging, resting, socializing and the communications of groups with calves," project leader Simon Berrow said. "Essentially we are building up what is like a dictionary of words they use or sounds they make." Berrow, a marine biologist, said the dolphins' clicks are used to find their way around and locate prey. The whistles are communications. "They do a whole range of other sounds like barks, groans and a kind of gunshot," he said. "The gunshot is an intense pulse of sound. Sperm whales use it to stun their prey." "When I first heard it I was surprised as I thought sperm whales were the only species who used it. We can speculate the dolphins are using it for the same reason as the sperm whales," Berrow said. References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been resident there as far back as the 6th century. They are regularly seen by passengers on the Shannon ferry and an estimated 25,000 tourists every year take special sightseeing tours on local boats to visit them.

单选题It is not clear whether the increase in reports is stemmed from greater human activity or is simply the result of more surveys.A. flowsB. comesC. derivesD. originates

单选题Plus substantial real estate tax abatements and other financial incentives.A. incrementB. reductionsC. rateD. package

单选题He {{U}}tended{{/U}} his grandmother in the hospital. A.looked for B.took care of C.kept up D.cared for