【原文書】 書名：Impact (4) 作者：Thomas Fast 出版社：Cengage 出版日期：2017/01/01 ISBN：9781305862968 內容簡介 　　Impact helps teenage learners better understand themselves, each other, and the world they, and the world they live in. 　　By encouraging self-expression, global citizenship, and active participation, Impact motivates students to explore who they are and who they want to be, all while learning English! 　　‧National Geographic Explorers are featured as role models who embody the 21st century skills and values teenagers need to become successful global citizens. 　　‧Cross-curricular topics engage learners with stimulating information about the world, better preparing them for future academic success. 　　‧Student-choice activities and projects present learners with options for language practice, allowing teens to become active participants in the learning process.