2010年考研英语冲刺：七选五就这点儿技巧

　　(c)转折让步关系：but, however, yet, on the contrary, by contrast, on the other hand, unfortunately, while, whereas, unlike, rather than ,instead of, it is true that,of course,although, though, even though, even if, nevertheless, despite, in spite of

　　例(大纲样题)

　　Long before Man lived on the Earth, there were fishes, reptiles, birds, insects, and some mammals. Although some of these animals were ancestors of kinds living today, others are now extinct, that is, they have no descendants alive now。

　　41  

    Very occasionally the rocks show impression of skin, so that, apart from color, we can build up a reasonably accurate picture of an animal that died millions of years ago. That kind of rock in which the remains are found tells us much about the nature of the original land, often of the plants that grew on it, and even of its climate。

　　［A］ The shellfish have a long history in the rock and many different kinds are known。
　　［B］ Nevertheless, we know a great deal about many of them because their bones and shells have been preserved in the rocks as fossils. From them we can tell their size and shape, how they walked, the kind of food they ate。
　　［C］ The first animals with true backbones were the fishes, first known in the rocks of 375 million years ago. About 300 million years ago the amphibians, the animals able to live both on land and in water, appeared. They were giant, sometimes 8 feet long, and many of them lived in the swampy pools in which our coal seam, or layer, formed. The amphibians gave rise to the reptiles and for nearly 150 million years these were the principal forms of life on land, in the sea, and in the air。
　　［D］ The best index fossils tend to be marine creatures. These animals evolved rapidly and spread over large over large areas of the world。
　　［E］ The earliest animals whose remains have been found were all very simple kinds and lived in the sea. Later forms are more complex, and among these are the sea-lilies, relations of the star-fishes, which had long arms and were attached by a long stalk to the sea bed, or to rocks。
　　［F］ When an animal dies, the body, its bones, or shell, may often be carried away by streams into lakes or the sea and there get covered up by mud. If the animal lived in the sea its body would probably sink and be covered with mud. More and more mud would fall upon it until the bones or shell become embedded and preserved。
　　［G］ Many factors can influence how fossils are preserved in rocks. Remains of an organism may be replaced by minerals, dissolved by an acidic solution to leave only their impression, or simply reduced to a more stable form。

　　【解析】［B］从试题前后的语义逻辑关系来看，试题前面的一段话表明的信息是Although some of these animals were ancestors of kinds living today, others are now extinct, that is, they have no descendants alive now(尽管这些动物是某些活到现在的物种的祖先，但有的动物却灭绝了，也就是说它们现在已经没有子孙后代活在这个世界上)。试题的后面的句子表明的信息是 Very occasionally the rocks show impression of skin, so that, apart from color, we can build up a reasonably accurate picture of an animal that died millions of years ago(有时候这些石头可以将它们的外表展现出来，这样，除了颜色我们就可以对那些数百年前死掉的生物形成一个比较准确的印象)。从语义关系里看，前文中说动物灭绝了，暗含的意思是我们不可能得到这些动物的任何信息，而后面的句子说我们可以对这些动物形成准确的印象，因此，前后文形成了明显的对比关系，四个选项中能够表达这种关系的，只有选项［B］。
　　本题还可以采用词汇的复现来确定正确答案，从试题后面的句子Very occasionally the rocks show impression of skin来看，rocks的前面使用了定冠词the修饰，这表明rocks在前文中一定出现过，但我们考察第一段时发现，第一段中并没有出现关于 rocks的内容，因此可以确定，关于rocks的内容一定出现在要填入的试题中。选项［B］ Nevertheless, we know a great deal about many of them because their bones and shells have been preserved in the rocks as fossils. From them we can tell their size and shape, how they walked, the kind of food they ate中出现了动物的骨骼被保存在the rocks中，变成化石的论述，由此可以判断选项［B］是正确答案。

　　(d)时间关系：afterwards, at first, at last, finally, first, firstly, in the first place, to start with，in the mean time, last, later, next, second, secondly, then, third, thirdly, to begin with以及一些具体的时间。

　　例(大纲样题)

　　…Of these, the ammonites are very interesting and important. They have a shell composed of many chambers, each representing a temporary home of the animal. As the young grew larger it grew a new chamber and sealed off the previous one. Thousands of these can be seen in the rocks on the Dorset Coast.     

　　45 　

    About 75 million years ago the Age of Reptiles was over and most of the groups died out. The mammals quickly developed, and we can trace the evolution of many familiar animals such as the elephant and horse. Many of the later mammals, though now extinct, were known to primitive man and were featured by him in cave paintings and on bone carvings。

　　［A］ The shellfish have a long history in the rock and many different kinds are known。
　　［B］ Nevertheless, we know a great deal about many of them because their bones and shells have been preserved in the rocks as fossils, From them we can tell their size and shape, how they walked, the kind of food they ate。
　　［C］ The first animals with true backbones were the fishes, first known in the rocks of 375 million years ago. About 300 million years ago the amphibians, the animals able to live both on land and in water, appeared. They were giant, sometimes 8 feet long, and many of them lived in the swampy pools in which our coal seam, or layer, formed. The amphibians gave rise to the reptiles and for nearly 150 million years these were the principal forms of life on land, in the sea, and in the air。
　　［D］ The best index fossils tend to be marine creatures. These animals evolved rapidly and spread over large over large areas of the world。
　　［E］ The earliest animals whose remains have been found were all very simple kinds and lived in the sea. Later forms are more complex, and among these are the sea-lilies, relations of the star-fishes, which had long arms and were attached by a long stalk to the sea bed, or to rocks。
　　［F］ When an animal dies, the body, its bones, or shell, may often be carried away by streams into lakes or the sea and there get covered up by mud. If the animal lived in the sea its body would probably sink and be covered with mud. More and more mud would fall upon it until the bones or shell become embedded and preserved。
　　［G］ Many factors can influence how fossils are preserved in rocks. Remains of an organism may be replaced by minerals, dissolved by an acidic solution to leave only their impression, or simply reduced to a more stable form。

　　【解析】［C］从文章的整体结构看，这里需要一个内容的“高潮”：前面几段讲的都是动物不断的进化过程，而下文中表示时间的短语“About 75 million years ago the Age of Reptiles was over” 很可能向我们传达了这样一个信息：文章对地球上动物进化过程的描写很有可能是按照时间顺序的，因此本题所在的段落和下面的段落很可能存在时间上的延续关系，即本题所在的段落很可能会提到比75 million years ago更早的时间。通过对比选项可知选项［C］中的两个表示时间的短语375 million years和150 million years和下一个段落中提到的时间状语具有了延续性，是正确答案。
　　此外，还可以采用词汇复现法解答本题。试题后面一句话About 75 million years ago the Age of Reptiles was over and most of the groups died out中的reptile在本题前的文章中从没有提到，在下文中又没有作为新信息，因而作为正确答案的选项中一定有这个词，只有［C］项中有“The amphibians gave rise to the reptiles for nearly 150 million years these were the principal forms of life on land, in the sea, and in the sea ,and in the air”。所以正确答案只能是［C］。

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