The textbook version is used for teachers' class and after-school materials, and the home version is used for students' autonomous learning and parental guidance. The price is around 100-200. I'm not sure. Some of them are from the school. Website: /CD will be printed with Hello? Teddy. There is Teddy below, who can print CD number, unit number, volume number and so on. Hong En Children's English? Jilin Electronic Publishing House? Hong En Early Childhood Education Research Center? Hong En Education and Training School? ISBN？ 7-900369-80-X, my CD can't print clearly. HELLO is a running program, and the icon on the G disk is a bear, so don't say much!