自然实验课的课前准备可分为知识准备、程序准备、器材准备等几个部分,它是实验课的起始环节,也是关系到实验教学成败的重要因素之一。1　知识准备广博的自然科学知识无疑是进行自然实验教学的先决条件,对自然科学知识做到“专”、“宽”、“新”等方面的充分准备,便可以做到深 The preparation of natural experiment class can be divided into three parts: preparation of knowledge, preparation of program, preparation of equipment, etc. It is the starting point of experiment class and also one of the important factors that affect the success or failure of experiment teaching. 1 Knowledge Preparation The extensive knowledge of natural science is undoubtedly the prerequisite for teaching natural experiments. By fully preparing the knowledge of the natural sciences such as “special”, “wide”, “new” and so on, we can achieve deep