在教学过程中,学生是最重要的资源,当然,教师是整个教学活动的组织者和引导者,教材作文师生之间的纽带,也同样不能忽视。要保证课堂变成生成性课堂,就需紧紧围绕学生、教师、教材等因素进行。一、保证开放的预设从一定角度上说,生成和预设是矛盾的两个方面,没有预设自然没有生成。在课堂教学中,科学、开放的预设是生成的前提。如教师先给每个小组分配了三个研钵和白色颗粒Pb In the process of teaching, students are the most important resources. Of course, teachers are also the organizers and guides of the whole teaching activities. The same can not be ignored. To ensure that the classroom into a productive class, we must closely focus on students, teachers, teaching materials and other factors. First, to ensure the precondition of openness From a certain point of view, the generation and presupposition are contradictory two aspects, there is no default nature is not generated. In classroom teaching, science and open preconditions are the prerequisites for generating. For example, teachers first assigned three mortars and white particles to each group