The first volume and the second volume are different. The Seventh Grade is a book published by Guangxi Education Publishing House in 2005. The authors are Zhao Wenlong and Du Yanhua. Official website, a seventh-grade all-in-one machine, shows that the red version is a comprehensive version, the blue A version is biased towards the first volume, the green version is biased towards the second volume, the red version is a basic version, followed by the blue version and the green version. Users can check it by themselves in official website, the seventh grade all-in-one machine.