单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。{{B}}第一篇{{/B}} The Gene Industry Major companies are already in pursuit of commercial applications of the new biology. They dream of placing enzymes (酶) in the automobile to monitor exhaust and send data on pollution to a microprocessor (微处理器) that will then adjust the engine. They speak of what the New York Times calls metal--hungry microbes that might be used to mine valuable trace metals from ocean water. They have already demanded and won the right to patent new life forms. Nervous critics, including many scientists, worry that there is corporate, national, international, and inter-scientific rivalry in the entire biotechnological (生物科技的) field. They create images not of oil spills, but of microbe spills that could spread disease and destroy entire populations. The creation and accidental release of extremely poisonous microbes, however, is only one cause for alarm. Completely rational and respectable scientists are talking about possibilities that stagger (使震惊) the imagination. Should we breed people with cowlike stomachs so they can digest grass and hay, thereby relieving the food problem by modifying us to eat lower down on the food chain? Should we biologically alter workers to fit the job requirement, for example, creating pilots with faster reaction times or assembly-line workers designed to do our monotonous work for us? Should we attempt to eliminate inferior people and breed a super-race? (Hitler tried this, but without the genetic weaponry that may soon issue from our laboratories.) Should we produce soldiers to do our fighting? Should we use genetic (遗传的) forecasting to pre-eliminate (除去) unfit (不合适的) babies? Should we grow reserve organs for ourselves, each of us having, as it were, a "savings bank " full of spare kidney, livers, or hands? Wild as thses notions may sound, every one has its advocates (and opposers) in the scientific community as well as its striking commercial application. As two critics of genetic engineering, Jeremy Rifkin and Ted Howard, state in their book Who Should Play God? "Broad scale genetic engineering will probably be introduced to America much the same way sa assembly lines, automobiles, vaccines, computers and all the other technologies. As each new genetic advance boomes commercially practical, a new consumer need will be exploitde and a market for the new technology will be created. "

单选题{{B}}第三篇{{/B}} Since about 1970, new research has helped brain scientists understands these problems better. Scientists now know there are many different kinds of learning disabilities and that they are caused by many different things. There is no longer any question that all learning disabilities result from differences in the way the brain is organized. You can' t look at a child and tell if he or she has a learning disability. There is no outward sign of the disorder. So some researchers began looking at the brain itself to learn what might be wrong. In one study, researchers examined the brain of a learning disabled person who had died in an accident. They found two unusual things. One involved cells in the left side of the brain, which control language. These cells normally are white. In the learning disabled person, however, these ceils were gray. The researchers also found that many of the nerve ceils were not in a line the way they should have been. The nerve cells were mixed together. The study was carried out under the guidance of Norman Geschwind, an early expert on learning disabilities. Doctor Geschwind proposed that learning disabilities mainly resultes from problems in the left side of the brain. He believed this side of the brain failed to develop normally. Probably, he said, nerve cells there didn't connect as they should. So the brain was like an electrical device in which the wires were crossed. Other researchers didn't examine brain tissue. Instead, they measured the brain's electrical activity and made a map of the electrical signals. Frank Dully experimented with this technique at Children's Hospital Medical Center in Boston. Dr. Duffy found large differences in the brain activity of normal children and those with reading problems. The differences appeared throughout the brain. Dr. Dully said his research is evidence that reading disabilities involve damage to a wide area of the brain, not just the left side.

单选题I feel regret about what"s happened.

单选题The teacher said she liked my composition, and then Uproceeded/U to criticize every line of it!

单选题The fuel tanks had a capacity of 140 liters.

单选题Older Volcanic Eruptions Volcanoes were more destructive in ancient history, not because they were bigger, but because the carbon dioxide they released wiped out life with greater ease. Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals, but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do. He calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava (熔岩) that they produced. He found that size for size, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals. The Permian (二叠纪) extinction, for example, which happened 250 million years ago, is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe. Those volcanoes are thought to have pumped out about 10 gigatonnes (十亿吨) of carbon as carbon dioxide. The global warming that followed wiped out 80 percent of all marine genera (种类) at the time, and it took 5 million years for the planet to recover. Yet 60 million years ago, there was another huge amount of volcanic activity and global warming but no mass extinction. Some animals did disappear but things returned to normal within ten thousands of years. "The most recent ones hardly have an effect at all." Wignall says. He ignored the extinction which wiped out the dinosaurs 65 million years ago, because many scientists believe it was primarily caused by the impact of an asteroid (小行星). He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO 2 . Vincent Courtillot, director of the Paris Geophysical Institute in France, says that Wignall"s idea is provocative. But he says it is incredibly hard to do these sorts of calculations. He points out that the killing power of volcanic eruptions depends on how long they lasted. And it is impossible to tell whether the huge blasts lasted for thousands or millions of years. He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced, and that lava volume may not necessarily correspond to carbon dioxide emissions.

单选题Eleanor Roosevelt urged legislation to assist the poor and oppressed.

单选题The manager allocate duties to the clerks.

单选题Louis was asked to name the man who stole her purse. A. confirm B. recognize C. claim D. identify

单选题Many scientists have been probing psychological problems.

单选题The weather was nice in Trumbull County on Saturday evening.

单选题The weather is a constant subject of conversation in Britain.

单选题Knowing that I had been out of work now, they were unwilling to lend me money.

单选题Mary just told us a very {{U}}fascinating{{/U}} story. A. strange B. frightening C. difficult D. interesting

单选题Paper or Plastic? Take a walk along the Chesapeake Bay, and you are likely to see plastic bags floating in the water. Ever since these now ubiquitous symbols of American super-consumption showed up in the supermarkets, plastic shopping bags have made their 1 into local waterways, and from there, into the bay, where they can 2 wildlife. Piles of them—the 3 takes centuries to decompose—show up in landfills and on city streets. Plastic bags also take an environmental toll in the form of millions of barrels of oil expended every year to produce them. Enter Annapolis 4 you will see plastic bags distributed free in department stores and supermarkets. Alderman Sam Shropshire has introduced a well-meaning proposal to ban retailers 5 distributing plastic shopping bags in Maryland"s capital. Instead, retailers would be required to offer bags 6 recycled paper and to sell reusable bags. The city of Baltimore is considering a similar measure. Opponents of the idea, however, argue that 7 bags are harmful, too: they cost more to make, they consume more 8 to transport, and recycling them causes more pollution than recycling plastic. The argument for depriving Annapolis residents of their plastic bags is 9 accepted. Everyone in this 10 is right about one thing: disposable shopping bags of any type are 11 , and the best outcome would be for customers to reuse bags instead. Annapolis"s mayor is investigating how to hand out free, reusable shopping bags to city residents, a proposal that can proceed regardless of whether other bags are banned. A less-expensive 12 would be to encourage retailers to give discounts to customers 13 bring their own reusable bags, a policy that a spokesman for the supermarket Giant Food says its chain already has in place. And this policy would be more 14 if stores imitated furniture mega-retailer Ikea and charged for disposable bags at the checkout counter. A broad ban on the use of plastic shopping bags, which would merely replace some forms of pollution with others, is not the 15 .

单选题Ants always put food away in Autumn. A. store B. steal C. eat D. carry

单选题We must abide by the rules.

单选题The little boy was so fascinated by the {{U}}mighty{{/U}} river that he would spend hours sitting on its bank and gazing at the passing boats and rafts.

单选题Which of the following is NOT mentioned as an example involving nonverbal thinking in paragraphs 1 and 2?

单选题Our English teacher is sick.A. fatB. weakC. illD. mad