起因: 原来上《水》这一课,我们仅仅让学生通过各种感观研究水的性质,虽然对学生的观察能力是很有训练价值的,但总的来说还是比较单调。整节课,只有对水这种司空见惯的物体的感知、感知、再感知,学生的学习兴趣并不浓。而且,我们给学生的材料是自来水,而不是蒸馏水,所以要想让学生研究出水 Cause: The original “water” class, we only allow students to study the nature of water through various sensations, although the observation of students is very training value, but in general it is quite monotonous. The whole lesson, only to water, a commonplace object perception, perception, and then perception, students interest in learning is not concentrated. Moreover, we give students the material is tap water, not distilled water, so to let students study effluent