现行初中教材《蜘蛛》已由第四册调到第三册。这是一篇知识性、科学性和趣味性较强的说明文。 作者在说明蜘蛛身体机构之巧妙时有这样一段文字:“它的腹内有数种腺,藏着液体,遇空气凝结成丝,用做最初的棚架和辐射线。……”乍一看,这是先总后分的说明顺序,也是分类说明法的运用。在“数种 The existing junior high school textbook “Spider” has been transferred from Volume IV to Volume III. This is a informative, scientific and interesting description. When describing the spider’s ingenuity, the author of this passage reads: “There are several kinds of glands inside the abdomen that contain liquids that condense into filaments and act as initial scaffolding and radiation ....” At first glance, This is the first total points after the description of the order, but also the classification of the use of law. In "several kinds