The theme of Unit 3 of Advanced English Comprehensive Course is cultural differences. This course is the third volume of Comprehensive Course of Advanced English for College Students 1-4. It is divided into six units. Each unit revolves around an independent theme, including a main article and two extended articles, reading 1 and reading 2. Each unit contains three teaching links, preview, in-class activities and after-school activities. The teaching content includes students reading independently, listening to the teacher's guidance and completing various learning tasks and homework (question and answer, test, discussion, speech, writing, translation, etc.). Textbook knowledge and skill training are closely related, and supporting exercises are targeted, aiming at achieving the effect of applying what you have learned.