Wang Wei listened to the class silently and carefully. She speaks very well. Introduction to history (I forgot the teacher's name) must be memorized. The teacher gave the class a poor score, but her knowledge was also quite profound. Yang Weidong's classes are good, too. He can hear quite a few unorthodox views. Tan Liming is a bit slow in giving lectures, but he speaks the common sense of ancient China very well. Other teachers don't remember much. They have graduated for several years. In a word, the library is your home, and reading more books is very helpful in the future.