The weekly exercise promotion paper is an auxiliary teaching material. The role of weekly exercises is to help students consolidate their knowledge points. On the premise of mastering the basic knowledge, you can do some questions to improve your ability, score and academic performance. Teaching AIDS refer to all kinds of publications such as study counseling and examination counseling which are matched with teaching materials and used by students, including: synchronous practice publications of teaching materials, homework publications in winter and summer vacations, exercise books for primary and secondary schools, and other publications such as study counseling and examination counseling for primary and secondary school students recognized by the administrative department of press and publication at or above the provincial level. Its product forms include books, newspapers, periodicals, audio-visual products, electronic publications and so on. Note: Students must adhere to the principle of voluntariness when purchasing textbooks. No unit or individual may force schools or students to buy any supplementary materials in any form or in disguised form, and may not enter schools to publicize, recommend and sell any supplementary materials.