关于结构: 这是一篇写得好的说明文,文章围绕中心意思(书目,是打开知识宝库的钥匙),对有关“书目”的知识作了五个方面的介绍,精悍谨严: 1.介绍书目,目录学的由来及其重要意义(包括1--4自然段); 2.介绍我国目录学的悠久历史(即第5自然段),前面说欧洲目录学十六世纪才兴起,这段说“在我国,远在西汉时期就出现 About structure: This is a well-written description of the central idea (bibliographic, is the key to open the treasure trove of knowledge), the knowledge of the “bibliography” made five aspects of introduction, diligent and cautious: 1. Introduction bibliography , The origin of bibliography and its significance (including 1--4 natural segments); 2. Introduction of the long history of bibliography in our country (ie the fifth paragraph of nature). Earlier it said that European bibliography was only emerging in the 16th century. "In our country, far in the Western Han Dynasty appeared