1) The document discusses the importance of using supplementary reading materials in addition to textbooks for social science education. It notes that textbooks alone cannot provide all the necessary information for students to fully understand topics. 2) Supplementary materials aim to widen students' perspectives, help connect past and present, enrich information from textbooks, develop critical analysis skills, and make social science teaching more engaging. 3) The document provides guidelines for effective use of supplementary readings and lists various material types, including historical fiction, biographies, plays, magazines, newspapers, and travel accounts. It emphasizes selecting age-appropriate materials to supplement classroom lessons.