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

单选题Many factory workers find their jobs tiresome.A. difficultB. pointlessC. profitableD. boring

单选题The chemical is deadly to rats but safe to cattle.

单选题Colleges and universities usually give diplomas or certificates to students who complete course requirements {{U}}adequately{{/U}}. A. responsibly B. sufficiently C. patiently D. successfully

单选题The story was touching .

单选题Your hair is so {{U}}tangled{{/U}} that it looks as if it has not been combed for a month.

单选题The sea was calm and still.

单选题I want an appointment with a definite time and place.A. durableB. deliciousC. fixedD. favorable

单选题She put down her {{U}}skinny{{/U}} hand slowly.

单选题Since ancient times people have found various ways to {{U}}preserve{{/U}} meat. A. eat B. cook C. freeze D. keep