《热空气》一课安排了两个实验,纸蛇旋转和塑料袋上升。在学生预习过程中,有的学生试做了,在汇报时讲到塑料袋上升了,学生观察到塑料袋上升了,就很高兴,认为成功了,不再去继续研究和探究下去,如果这样就满足了,一是不利于培养学生的探究精神和科学意识,二是不能体现教材的价值。 The “hot air” lesson arranged two experiments, a paper snake spinning and a plastic bag going up. During the course of the student preview, some students attempted to do so. When reporting, they said that the plastic bags had gone up. Students observed that the plastic bags had risen. They said they were very successful and would not go on studying and exploring. If so It is satisfied, one is not conducive to cultivate students' spirit of exploration and scientific awareness, and second, can not reflect the value of teaching materials.