华师大教授叶澜认为:一堂好课虽然没有绝对的标准,但有一些基本的要求,它应该是一个充满活力、具有灵气的课堂,而其活力、灵气正体现在课堂的有效生成。只有实现有效生成的课才是一堂有效的课,也才是一堂好课。而有效生成离不开精心的预设,有效生成也是在更好的完 Ye Lan, professor of China Normal University, thinks: Although there is no absolute standard for a good class, there are some basic requirements. It should be a dynamic and aura class, and its vitality and aura are embodied in the effective production of the class. Only effective realization of the class is an effective lesson, but also is a good lesson. The effective generation can not be separated from the meticulous precondition, the effective generation is also a better end