高考英語(yǔ)試題及答案江蘇卷-在線瀏覽
2025-03-07 07:17本頁(yè)面
【正文】 arcely imaginable three decades ago. The disappearance of the queues in these places may seem an unusual concern, but these are not the only places that markets have entered.58. According to the author, which of the following seems governed by the principle “First e, first served”?A. Taking buses. B. Buying houses.C. Flying with an airline. D. Visiting amusement parks.59. The example of the recorded message in Paragraphs 4 and 5 illustrates.A. the necessity of patience in queuing B. the advantage of modern technologyC. the uncertainty of allocation principle D. the fairness of telephonic services60. The passage is meant to.A. justify paying for faster services B. discuss the morals of allocating thingsC. analyze the reason for standing in line D. criticize the behavior of queue jumpingCIf a diver surfaces too quickly, he may suffer the bends. Nitrogen(氮)dissolved(溶解) in his blood is suddenly liberated by the reduction of pressure.The consequence, if the bubbles (氣泡)accumulate in a joint, is sharp painand a bent body—thus the name. If the bubbles form in his lungs or his brain,the consequence can be death.Other airbreathing animals also suffer this depression(減壓)sickness if they surface too fast: whales, for example. And so, long ago, didichthyosaurs. That these ancient sea animals got the bends can be seen fromtheir bones. If bubbles of nitrogen form inside the bone they can cut off itsblood supply. This kills the cells in the bone, and consequently weakens it,sometimes to the point of collapse. Fossil (化石)bones that have caved in onthem selves are thus a sign that the animal once had the bends.Bruce Rothschild of the University of Kansas knew all this when he began a study of ichthyosaur bones to find out how widespread the problem was in the past. What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of depression over the 150 million years. To this end, he and his colleagues traveled the world’s naturalhistory museums, looking at hundreds of ichthyosaurs from the Triassic period and from the later Jurassic and Cretaceous periods.When he started, he assumed that signs of the bends would be rarer in younger fossils, reflecting their gradualevolution of measures to deal with depression. Instead, he was astonished to discover the opposite. More than15% of Jurassic and Cretaceous ichthyosaurs had suffered the bends before they died, but not a single Triassic specimen(標(biāo)本) showed evidence of that sort of injury.If ichthyosaurs did evolve an antidepression means, they clearly did so quickly—and, most strangely, they lost it afterwards. But that is not what Dr Rothschild thinks happened. He suspects it was evolution in other animals that caused the change.Whales that suffer the bends often do so because they have surfaced to escape a predator (捕食動(dòng)物) such as a large shark. One of the features of Jurassic oceans was an abundance of large sharks and crocodiles, both of which were fond of ichthyosaur lunches. Triassic oceans, by contrast, were mercifully shark and crocodilefree. In the Triassic, then, ichthyosaurs were top of the food chain. In the Jurassic and Cretaceous, they were prey(獵物) as well as predator—and often had to make a speedy exit as a result.61. Which of the following is a typical symptom of the bends?A. A twisted body. B. A gradual decrease in blood supply.
試題試卷相關(guān)推薦
鄂ICP備17016276號(hào)-1