一、制订计划缘于研究活动的需要1.创设问题情境,从实验观察中提出研究问题。教师在一杯水里连续加几勺食盐,提问:这样一直加下去,食盐会怎样?引导学生思考:食盐能无限地溶解在这杯水里吗?学生根据生活经验和对溶解的初步认识,会提出自己的看法。教师提问:如果你认为不会,那么 First, the formulation of the program due to the needs of research activities 1. Create a problem situation, put forward from the experimental observation of research issues. Teachers in a glass of water add a few tablespoons of salt, ask: This has been added, what will salt? Guide students to think: salt can be infinitely dissolved in this glass of water? Students based on life experience and understanding of the dissolution of the first Make your own opinion. Teacher Question: If you do not think so, then