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How about the sales of teaching AIDS for the comprehensive senior high school entrance examination?
Tall man. The series of supplementary books published by Sunshine Publishing House, with an annual sales volume of 80 million copies, are the practitioners and pioneers of educational reform. More than 3,000 dealers spread all over the country, reaching15,000 schools and covering more than 20 million users. "All-round Teaching Aids for Senior High School Entrance Examination": This book is a series of teaching AIDS published by Sunshine Publishing House, including primary schools and junior high schools, covering Chinese, mathematics, physical chemistry and other disciplines.