Fit. The book Dian Zhong Dian is more difficult, which is very helpful for the breakthrough of key and difficult points. Suitable for students who have a solid foundation and need to practice more to improve their grades, and the score is stable at above 80 to around 90, so there are more than 80 points in Band 4, which is suitable for the midpoint of the exam. Diandian is a famous supplementary teaching material edited by Rong and has become one of the favorite teaching materials for teachers, parents and students. Annual sales hit a record high. The explanation is accurate, the exercises are diverse, the topics are classic, the topics are flexible and changeable, and the knowledge points are strengthened. It contains special final training papers and scientific division modules, which conform to the rules of final review and examination and help students to systematically integrate and review their knowledge.