古诗云“问渠哪得清如许,为有源头活水来”。课堂如果缺少生机活力,那将是一潭死水,窒息学生呼吸,抑制学生创新。课堂教学的“源头活水”即为教师课前的预设:精心的构思,细致的准备。而水之清澈要靠学生的参与、感悟、创造,直至生成知识。本文将 Ancient poetry cloud “Ask where the clear can be like this, for the first source of live water to ”. If the classroom lacks vitality, it will be a backwater, stifling student breath and inhibiting student innovation. The “source water” of classroom teaching is the pre-school teacher’s presupposition: meticulous conception and meticulous preparation. The clarity of the water depends on the student’s participation, sentiment, and creation until knowledge is generated. This article will