[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.
41.【解析】选[B]。本题主要通过句组关系的理解来解答。跳过空格阅读第一段可以看出,本段主要讲述了史前动物的存在、部分种类的灭绝以及从化石中我们所能发现的数百万年前就死掉了的动物的精确印记和当时的地貌及气候特征。由此,我们就看到了空格前后两个句组所叙述内容之间的矛盾和内容上的不足:1)既然已经灭绝,怎么还能了解有关的这一切呢?说明空格前的句子与其空格所在的句子之间具有转折关系。2)空格后第一句中the rocks指的又是什么石头呢?需要在前有所提及,即正确选项中应包含有rock这个词。能够同时满足这两个条件的只有选项[B]。[A]、[E]、[G]中也提到了rock,但在句际关系上与前后句组不相吻合,故不正确。所以正确答案只能是[B]。
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