Teaching should not only let students master the conclusion of knowledge, but also let students know the process of knowledge occurrence and development. In teaching, teachers should be good at creating inquiry situations, inducing students to operate by themselves, observing with their eyes, thinking with their brains and expressing with their mouths, so as to gain the harvest of explorers, the joy of discoverers and the joy of winners. Rogers, an American psychologist, pointed out that teachers should take it as their responsibility to form a good classroom psychological atmosphere and let students participate more fully and enthusiastically in the whole teaching process.