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②选项中出现代词时，该选项往往不能放在首句，并要注意指代成立的条件。
it可指代前面的单数名词或整个句子；
they或them指代前面的复数名词；
one指代前面的单数可数名词；
that指代前面的不可数名词或句子；
this指代前面的单数名词或句子。
4再细看语篇原文，明确五个空缺位应填入的选项，并最后将答案嵌入文章，通读全文，检查文章是否主题一致，各段落是否符合统一性（unity）和连贯性（coherence），从而印证所选答案的正确性。这一步与前三步同等重要，切不可忽视。
四、 大纲样题及2005年真题解析
（一）大纲样题
Directions：
In the following text； some sentences have been removed。 For Questions 41—45； choose the most suitable one from the list A—G to fit into each of the numbered blanks。 There are two extra choices； which do not fit in any of the blanks。 Mark your answers on ANSWER SHEET 1。 （10 points）
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。 The 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。
42） 。 Nearly all of the fossils that we know were preserved in rocks formed by water action； and most of these are of animals that lived in or near water。 Thus it follows that there must be many kinds of mammals； birds； and insects； of which we know nothing。
43） 。 There were also crablike creatures； whose bodies were covered with a horny substance。 The body segments each had two pairs of legs； one pair for walking on the sandy bottom； the other for swimming。 The head was a kind of shield with a pair of pound eyes； often with thousands of lenses。 They were usually an inch or two long but some were 2 feet。
44） 。 Of these； the ammonites are very interesting and important。 They have a shell posed 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 shell fish 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 were 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； or formed。 The amphilbians 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 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 plex； and among these are the sealilies； relations of the starfishes； 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 bee 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。
考纲链接
本文严格按照考试大纲的精神选材、设题，文章主干部分总字数为342字，而选项部分总字数为327词，即所有的给出信息总阅读量高达669词。相当于传统阅读题型的一篇半或将近两篇文章的阅读量，因此，该题型要求我们要有较好的阅读方法和一定的阅读理解能力。
文章导读
本文的文章结构脉络非常清晰，其主题是化石和早期生物的进化。文章首先介绍了什么是史前动物，接下来谈论了化石是什么以及化石形成的过程。文章又谈论了化石中保存的生物种类，以及这些生物是如何进化的：首先是简单的生命形式，如贝类动物，然后是脊椎动物，如两栖动物与哺乳动物。爬行动物的时代结束后，包括人类在内的哺乳动物占据了统治地位。
答案与解析
41【答案】B
【解析】文章的第一段中出现的空白处，最有可能的就是让补充主旨句。在做出选择之前，我们必须通读全文至少一遍，并动用自己的归纳总结的能力，尽可能选出最能够涵盖全文内容的选项。在读文章的过程中，我们要学会抓关键词，比如，第二段中有：rock； skin； accurate picture； climate。。。主要讲动植物在岩石上留下的印记能够让人了解它们的模样甚至所处的气候。第四、五、六段虽不完整，但是我们也能抓一些关键词：fossil； kinds； horny substance； two pairs of legs； shield with a pair of pound eyes； an inch or two long； shell。。。大致是说通过化石，我们可以知道一些动植物的具体模样，比如第五段就对某一生物进行了具体描述，有几条腿、几只眼等等。由此可见，最能够体现全文内容的只有B。
42【答案】F
【解析】本题是第二段的段首部分，应该是既能与第一段的内容有一定的连贯性，又能与第二段中的重点提示信息相关联的选项。第二段中要点提示线索指出，几乎我们所知道的所有化石都是由于水的作用而被保存在了石头中，而且大多都是生活在水里或水边的动物。选项F末尾的衔接成分“more and more”（越来越多的）与空白之后的“nearly all”（几乎所有的）相互呼应。所以F是正确选项。
43【答案】E
【解析】要选出本题的正确答案必须明确讨论的重心已经转移到了对螃蟹般的复杂动物的描述上。这些生物之前又是什么呢？只有选项E回答了这个问题。人们发现的最早的动物遗骸都是些非常简单的物种，而且都生活在海洋里。后来的物种比较复杂，其中包括海百合，它们是海星的亲戚，海星有长长的触手，可以通过其长柄吸附在海底或石头上。本题的正确选项是E。
44【答案】A
【解析】本题是第四段的段首部分，应该是此段的主题句，在此句中，单词shell起到了举足轻重的承上启下的作用。A谈到了贝类动物及其种类。空白之后的第一个段落里的“Of these”（其中）连接起了贝类与菊石（ammonites）。因此，本题的正确答案应是A。
45【答案】C
【解析】本题是选择一个段落，我们必须从全文的整体结构着手。根据上下文内容提示以及文章第一句，我们知道，此段内容应该既能够承接有壳的水生动物，又能够引出下文爬行动物时代结束这样的内容，因此，所选答案应该是介绍这两种动物之间的生物过渡群种。只有C，它既说到了“鱼类是最先有脊柱的动物”又说到“之