课堂教学是一门艺术，要使每一堂课达到教学目的，教师就要在有限的时间内充分发挥各方面才能，特别是作为一名自然教师，不仅要有丰富的知识，卓越的见解，创造性的思维，更要有良好的心理素质，特别要有一定的应变技巧。一、应变要快捷准确自然知识丰富有趣，又和生活联系紧 Classroom teaching is an art. To make each class reach its goal of teaching, teachers should give full play to all aspects of ability in a limited time. Especially as a natural teacher, not only should they have rich knowledge, excellent ideas and creativity Thinking, but also have a good psychological quality, in particular, have a certain degree of adaptability skills. First, the strain should be quick and accurate Natural knowledge is rich and interesting, and life and contact tight