第四版前言 使用说明 Unit 1 On English Language Teaching Reference Key to Exercises Chinese Translation of Readings Part A 言语群体 Part B I. 拼写错误使毕业生错失就业机会 II. 我们这混乱的语言 Unit 2 Campus Life Teaching Reference Key to Exercises Chinese Translation of Readings Part A 大学时代 Part B I. 真正的检验 II. 学生学会作弊 Unit 3 Cultural Differences Teaching Refe