巧妙的设疑就是提出问题的一个过程,如果学生能参与进来,学生的学习积极性就会被调动起来,教学效果也明显提高。同时,科学教学内容的抽象性很容易使学生感到乏味,所以,课堂上老师如果能巧妙设疑、及时设疑,探究问题,既可以有效激活学生思维, Cleverly set doubts is to ask questions of a process, if students can participate in, students’ enthusiasm for learning will be mobilized, teaching effectiveness is also significantly improved. At the same time, the abstraction of the contents of science teaching can easily make the students feel tedious. Therefore, in the classroom, if teachers can skillfully set up suspicions, timely set doubts and probe into problems, they can both effectively activate students’ thinking,