Come back. The activation code is on the back of the book, not on the front. The activation code of New World Audiovisual is on the back of the book. Introduction to the main contents of the audio-visual course of New World University English series textbooks: The series of New World University English textbooks were compiled by Yilin Publishing House on the basis of the original textbook hemisphere and in strict accordance with the requirements of college English curriculum, organized by famous English experts at home and abroad. This series of textbooks is novel in material selection, rich in content, advanced in concept and complete in system. It is a set of distinctive three-dimensional college English textbooks, which integrates reading, writing, translation, watching, listening and speaking. It is basic, scientific and epochal. This textbook helps to consolidate and expand students' basic English knowledge and ability; The content arrangement is gradual and concise, which conforms to the law of language learning and the latest trend of college English teaching reform.