单选题The bed has been______in the family. It was my great grandmother's originally.

单选题If she doesn' t tell him the truth now, he' ll simply keep on asking her until she______ A. does B. has done C. will do D. would do

单选题Artificial hearts have long been the stuff of science fiction. In "Robocop", snazzy cardiac devices are made by Yamaha and Jensen, and in "Star Trek", Jean-Luc Picard, captain of the Enterprise, has one implanted in the year 2328. In the present day, however, their history has been more chequered. The first serious attempt to build one happened in the 1980s, when Jarvik-7, made by Robert Jarvik, a surgeon at the University of Utah, captured the world's attention. But Jarvik-7 was a complicated affair that needed to be connected' via tubes to machines outside the body. The patient could not go home, nor even turn around in bed. Various other designs have been tried since, but all were seen as temporary expedients intended to tide a patient over until the real thing became available from a human donor. That may be about to change. This week, America's Food and Drug Administration gave its approval to a new type of artificial heart made by Abiomed, a firm based near Boston. The agency granted a "humanitarian device exemption", a restricted form of approval that will allow doctors to implant the new device in people whose hearts are about to fail but who cannot, for reasons such as intolerance of the immunosuppressive drugs needed to stop rejection, receive a transplant. Such people have a life expectancy of less than a month, but a dozen similarly hopeless patients implanted with Abiomed's heart survived for about five months. Unlike Dr. Jarvik's device, this newfangled bundle of titanium and polyurethane alms to set the patient free. An electric motor revolving up to 10 000 times a minute pushes an incompressible fluid around the Abiomed heart, and that fluid, in turn, pushes the blood--first to the lungs to be oxygenated, and then around the body. Power is supplied by an electric current generated in a pack outside the body. This induces current in the motor inside the heart. All diagnostics are done remotely, using radio signals. There are no tubes or wires coming out of the patient. The charger is usually plugged into the mains, but if armed with a battery it can be carried around for hours in a vest or backpack, thus allowing the patient to roam freely. Most strikingly, the device's internal battery can last half an hour before it needs recharging. That allows someone time to take a shower or even go for a quick swim without having to wear the charger. Abiomed's chairman, Michael Minogue, does not claim that his firm's product will displace human transplants. Even so, the firm has big ambitions. It is already developing a new version that will be 30% smaller (meaning more women can use it) and will last for five years. That should be ready by 2008--320 years earlier than the writers of "Star Trek" predicted.

单选题Mrs. Robson had lived in the house ______.

单选题 Unless we spend money to spot and prevent asteroids (小行星)now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星)that race across the night sky. Most orbit the sun far from Earth and don't threaten us. But there are also thousands whose orbits put them on a collision course with Earth. Buy $ 40 million worth of new telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we'll have a way to change its course. Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn't be cheap. Is it worth it? Two things experts consider when judging any risk are : 1) How likely the event is ; and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 400, 000 years. Sounds pretty rare-but if one did fall, it would be the end of the world. "If we don't take care of these big asteroids, they'll take care of us," says one scientist. "It's that simple. " The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? "The world has less to fear from doomsday (毁灭性的) rocks than from a great nuclear fleet set against them," said a New York Times article.

单选题 Among the government's most interesting reports is one that estimates what parents spend on their children. Not surprisingly, the costs are steep. For a middle-class, husband-and-wife family (average pretax income in 2000: $ 76 250), spending per child is about $12 000 a year. With inflation the family's spending on a child will total $ 286 050 by age 17. The dry statistics ought to inform the ongoing deficit debate, because a budget is not just a catalog of programs and taxes. It reflects a society's priorities and values. Our society does not—despite rhetoric (说辞) to the contrary—put much value on raising children. Present budget policies tax parents heavily to support the elderly. Meanwhile, tax breaks for children are modest. If deficit reduction aggravates these biases, more Americans may choose not to have children or to have fewer children. Down that path lies economic decline. Societies that cannot replace their populations discourage investment and innovation. They have stagnant (萧条的) or shrinking markets for goods and services. With older populations, they resist change. To stabilize its population—discounting immigration—women must have an average of two children. That's a fertility rate of 2.0. Many countries with struggling economies are well below that. Though having a child is a deeply personal decision, it's shaped by culture, religion, economics, and government policy. 'No one has a good answer' as to why fertility varies among countries, says sociologist Andrew Cherlin of The Johns Hopkins University. Eroding religious belief in Europe may partly explain lowered birthrates. In Japan young women may be rebelling against their mothers' isolated lives of child rearing. General optimism and pessimism count. Hopefulness fueled America's baby boom. After the Soviet Union's collapse, says Cherlin, 'anxiety for the future' depressed birthrates in Russia and Eastern Europe. In poor societies, people have children to improve their economic well-being by increasing the number of family workers and providing support for parents in their old age. In wealthy societies, the logic often reverses. Government now supports the elderly, diminishing the need for children. By some studies, the safety nets for retirees have reduced fertility rates by 0.5 children in the United States and almost 1.0 in Western Europe, reports economist Robert Stein in the journal National Affairs. Similarly, some couples don't have children because they don't want to sacrifice their own lifestyles to the time and expense of a family. Young Americans already face a bleak labor market that cannot instill (注入) confidence about having children. Piling on higher taxes won't help, 'If higher taxes make it more expensive .to raise children, ' says Nicholas Eberstadt of the American Enterprise Institute, 'people will think twice about having another child.' That seems like common sense, despite the multiple influences on becoming parents.

单选题The commercial center______will be the most magnificent one in the city.

单选题In the eighteenth century writers ______ hours in coffee houses, discussing the news of the day.

单选题From the passage we learn that ______.

单选题All of the dental instruments need to be ______ before the next patient is seen.

单选题(It is) (extremely) important (for) an engineer (to know) to use a computer.A. It isB. extremelyC. forD. know

单选题They need to move to new and large apartments. Do you know of any______ones in this area?

单选题Although punctual himself, the professor was quite used______late for his lecture.

单选题Do you really think Bill will help you write the report? Don't count your chickens ______. they are hatched.

单选题In the law court, the suspect couldn't ______his time that night.

单选题下面的短文后列出了10个句子，请根据短文的内容对每个句子作出判断：如果该句提的是正确信息，选择A；如果该句提供的是错误信息，选择B；如果该句的信息文中没有提及，选择C，并将所选答案的代码（指A、B或C）填在答题纸的相应位置上。Red Nose Day　　Red Nose Day （RND） is a well-known event in the UK.The aim of the clay is

单选题Shop prices in June fell at the fastest 25 rate since at least 2006 as 26 fought to attract customers, the British Retail Consortium (BRC) has said. Prices were 1.8% lower in June compared with a year earlier, the BRC said. It is the biggest annual fall in prices since the BR's 27 began in December 2006 and the 14th month in a 28 that prices have decreased. The price of electrical goods and clothing both fell. Prices for non-food 29 were 3.4% lower in June compared with a year ago, while the rise in the cost of food slowed to 0.6%—its lowest pace since the series began. The BRC survey does not include online retailers or costs such as energy, transport and housing, which feed into the broader official consumer price 30 (CPI) measure 31 by the Bank of England. Competition among retailers for market share is driving the record fall in prices, the BRC said. 'Fierce competition among 32 has driven food price inflation to record low levels and with some grocers having announced plans to keep prices down, 33 stand to benefit for a while to come,' said BRC director-general Helen Dickinson. CPI inflation fell to a four-and-a-half year low of 1.5% in May, helped by the sharpest fall in food and non-alcoholic 34 prices for a decade. A. manufacturer B. experiment C. annual D. retailers E. survey F. recession G. grocers H. inflation I. article J. items K. beverage L. targeted M. row N. consequence O. consumers

单选题—I didn’t go to class last night because my car broke down. —You_______ mine. I wasn't using it.