《科学》教材与原来的自然教材比较,有一个显著不同,就是每一课都是由若干个活动组成,每一节都是从活动开始的,而且每个活动间都具有一定的结构性。对于结构性活动的意义,特级教师章鼎儿形象地概括为“1+1>2”,甚至是“-1+1>2”,因此要上好科学课,必须先挖掘教材中结构性的活动内容,理清各个活动间的结构性因素。下面我就结合《纸》单元的备课谈谈我的一些想法。 One striking difference between the Science textbook and the original textbook is that each lesson consists of a number of activities, each starting with the activity, and each of the activities having a certain structure. For the meaning of structural activity, top class teacher Zhang Dinger is vividly summarized as “1 + 1> 2” or even “-1 + 1> 2”, so to take a good science class, we must first excavate the structural Activities, to clarify the structural factors between various activities. Now I will talk about some of my ideas in preparation for the “paper” unit.