实验,在小学自然教学中,既是重要基础,又是重要内容;既是重要方法,又是重要手段。要提高小学自然教学质量,就要上好实验课。怎样才能保证实验的成功呢?这在很大程度上取决于教师预做实验的情况。下面,笔者谈谈教师预做实验的好处。好处之一,教师预做实验,有利于实验内容的熟悉。教学《怎样认识物体(四)——金属》之前,我预做了研究“金属性质”的六个实验:观察金属表面的光泽,金属传热,金属导电性,金属有延展性,金属能跟酸、碱起反应,金属在高温下变软熔化。由于预先做 Experiments in primary school nature teaching are both an important foundation and an important one. They are both an important method and an important method. To improve the quality of primary school teaching, we must take a good experimental class. How to ensure the success of the experiment? This depends largely on the teachers pre-experiment. Next, I talk about the benefits of pre-experiment teachers. One of the benefits, teachers pre-experiment, is conducive to the familiar content of the experiment. Before teaching “How to Know Object (4) - Metal”, I made six experiments beforehand on the study of “the nature of metal”: observing the luster of the metal surface, the heat transfer of the metal, the conductivity of the metal, the ductility of the metal, Acid, alkali reaction, the metal softens at high temperatures. As pre-made