《21世纪大学英语》（S版）系列教材（第3版）根据国家教育部颁布的《大学英语教学指南》（2020版）和《中国英语能力等级量表》以及我国高等院校人才培养特点和教学改革的最新成果编写而成，突出教育必须立德树人的时代要求，重视教学内容的实用性和针对性，在帮助学生培养正确的世界观、人生观和价值观的同时，将语言基础能力的培养与实际涉外交际能力的训练有机地结合起来，以满足新时代社会经济发展对大学生的要求。
本系列核心教材包括《综合教程》《综合练习》《教学参考书》（每一种分为1—4册）及配套的MP3、微课、助教 PPT课件、“i学”App移动平台网络课程、超星“学习通”App示范教学包等。本套教材供高等院校普通英语教学使用。
本书为《教学参考书》第3册，共8个单元，每个单元根据《综合教程》的相关内容配备教法推荐、作者介绍、背景知识、课文详解以及练习答案和录音文本等。同时，本书在版式设计上力求易用（user-friendly），将学生用书的内容完整地融入教学参考书，课文讲解采用“左学右教”的方式，以方便教师教学。本书另配有PPT助教课件。

Unit 1 Wearable Technology
I.objectives
II．Suggested Teaching Plan
III．Background Information
IV．Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A：What Is Wearable Technology?
Text B：A Look into the Future of Wearable Electronics
Part Ⅳ Speaking
Part V Translation＆Writing (Sales Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
Unit 2 Sustainable Livlng
I.objectives
II．Suggested Teaching Plan
III．Background Information
IV．Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
TextA：MakingDo WithouttheMinivan
TextB：ADayin a GreenerLiye
Part Ⅳ Speaking
Part V Translation＆Writing(OfferLetters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
Unit 3 Road to Success
I.objectives
II．Suggested Teaching Plan
III．Background Information
IV．Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
TextA：Hayto YourStrengths
TextB：TheLanguageofSuccess
Part Ⅳ Speaking
Part V Translation＆Writing(Order Letters)
Part Ⅵ Critical Thinking
Part Ⅶ TimetoRelax
Unit 4 Space Technology l
I.objectives
II．Suggested Teaching Plan
III．Background Information
IV．Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A：Eve in the Sky
Text B：SpaceJunk
Part Ⅳ Speaking
Part V Translation＆Writing(Confirmation Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
Unit 5 Travel
I.objectives
II．Suggested Teaching Plan
III．Background Information
IV：Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
11ext A：Around the World at
11extB：TravelSchool
Part Ⅳ Speaking
Part V Translation＆Writing(Verification Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
Unit 6 Teaching
I.objectives
II．Suggested Teaching Plan
III．Background Information
IV Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
TextA：What Makes a MaserTeacher?
Text B：Getting Behind the Teacher's Desk
Part Ⅳ Speaking
Part V Translation＆Writing(Resignation Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
Unit 7 Construction
I.Objectives
II．Suggested Teaching Plan
III．Background Information
IV．Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A：A Mile High in the Sky
Text B：World's Coolest Skyscraper
Part Ⅳ Speaking
Part V Translation＆Writing (Adjustment Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
Unit 8 Code of Conduct
I.Objectives
II．Suggested Teaching Plan
III．Background Information
IV．Class Presentation
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A：Real WorldABCs：Your Code of Conduct yor Life(A-L)
Text B：Real WorldABCs：Your Code of Conduct yor Life (M—Z)
Part Ⅳ Speaking
Part V Translation＆Writing(Price Increase Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to relax 46
Grammar Review
I.直接引语与间接引语
11.定语从句(Ⅰ)
III．定语从句(Ⅱ)
IV.名词性从句
V.同位语从句
VI．时间、地点和方式状语从句
VII．条件、让步和原因状语从句
VIII．结果、目的和比较状语从句