Introduction to College English Extensive Reading Course (Volume III): This textbook is divided into four volumes, each with 10 unit and 2 articles in each unit. The first part of each unit in Book One and Book Two introduces the background knowledge of western culture, and the second part introduces the background knowledge of the text. According to the characteristics of the subject and the current needs of students, this set of teaching materials starts from the third volume, and the first article of each unit is popular science knowledge, aiming at providing students with a certain amount of vocabulary and related knowledge of various subjects, thus expanding the English vocabulary and knowledge of the corresponding subjects, and laying a solid foundation for students to read English materials in their professional fields in the future and directly understand the advanced technology and scientific research trends of this subject in the world.