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By providing young people with knowledge and interesting scientific and cultural knowledge, this series of Olympic Training and Selection for Primary and Secondary School Students aims to stimulate their enthusiasm to learn and love science, guide them to broaden their horizons and innovate constantly, and finally achieve the goal of improving their comprehensive quality. It involves many areas of knowledge that young people must know. It has strong systematicness, practicality and modernity. It is the best book for young people to learn.