Without the optional courses of Chengdu No.7 High, Li Yingrui couldn’t have been interested in biology. He worked hard in high school, otherwise he couldn’t have been admitted to Peking University. He always says it’s strange that the students should waste their best hours in life. He suggests that high school students should be devoted to learning. With the diagnosis exam approaching, it is high time that you worked harder. It looks as if he were more than 35.