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.

　　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.

　　我们一起来分析41题的做法，按照PART A部分的阅读方法，通过阅读该空缺前面的段落，我们能够抓住的重要信息是：Although some of these animals were ancestors of kinds living today， others are now extinct.同理，空缺之后的段落告诉我们的重要信息是：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.

　　对比空缺前后的两个重要信息之后不难发现，extinct和a reasonably accurate构成了一对矛盾，要解决这一矛盾，我们可以大胆假设：在空缺的段落处必然发生过一次转折，否则，文章内容的连贯性和逻辑性就无法保证。基于这一假设，我们去逐一浏览选项，会迅速定位到B项一个明确的标志词Nevertheless，恰好传递了强转折的逻辑意味。将B项带回原文通读，发现其无论是内容还是逻辑上都符合行文的要求。因此可断定为正确项。

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