In the seventh grade of junior high school, science enters high school and trains top students, which are all good teaching AIDS, and the difficulty is similar. According to relevant public information, the combination of high-level training and ability training, and the combination of peacetime training and unit testing constitute a brand-new learning system. There are many training questions and basic questions for top students, but the difficulty is not simple, there are levels, there are promotion questions and problems. This book is more suitable and has a good foundation. Students with good knowledge can consolidate their knowledge by brushing questions.