《普通高中生物课程标准》指出:学习和教学方法必须是开放而多样的,开放性是课堂教学评价的一条重要原则。它要求课堂教学做到:一是在教学中激发学生的学习活力,不断激起学生的探索、发现、想象和表现的愿望,让学生的思维、心态处于开放状态。二是创设有利于学生发展的开放式教学情境,通过教学时空的拓展变换、教学评价方法的多元化、师生之间的多向交流,为学生营造一个开放的学习空间,以激发学生的学习活力。三是不 “Ordinary high school biology curriculum standards” that: learning and teaching methods must be open and diverse, openness is an important principle of classroom teaching evaluation. It requires classroom teaching to do: First, to stimulate students ’learning vitality in teaching, and constantly arouse the desire of students to explore, discover, imagine and express, so that students’ thinking and mentality are in an open state. The second is to create an open teaching environment that is conducive to the development of students. Through the expansion and transformation of teaching time and space, the diversification of teaching evaluation methods and the multi-directional communication between teachers and students, an open learning space is created for students to stimulate students’ learning vitality. Three is not