一、玩一玩,问题发现了发现问题是思维活动的前提。但小学生在发现问题时,很大程度上依赖于已有的经验,局限性很大,教师应正确启迪学生的思维,让学生成为知识的发现者。如教《蒸发》一课,为了证明水蒸发时能吸收周围的热,我设计了这样的实验:给全班每一位同学准备了一只温度计? First, play a play, the problem found that the problem is the prerequisite for thinking activities. However, when pupils find problems, they largely rely on their own experience and have great limitations. Teachers should correctly enlighten students' thinking and make students become discoverer of knowledge. As an example of teaching “Evaporation”, in order to prove that the water can evaporate the surrounding heat, I designed an experiment in which a thermometer was prepared for every classmate in the class.