Unit 1 Laughter is good for you 1
Welcome to the unit and Reading 2
Word power＆Grammar and Usage 9
Task and Project 11
Unit 2 What is happiness to you? 21
Welcome to the unit and Reading 22
Word power＆Grammar and Usage 29
Task and Project 32
Unit 3 Understanding each other? 44
Welcome to the unit and Reading 45
Word power＆Grammar and Usage 52
Task and project 55
Unit 4 Helping people around the world 66
Welcome to the unit and Reading 67
Word power＆Grammar and Usage 74
Task and Project 78
第一单元 检测题 91
第二单元 检测题 99
第三单元 检测题 107
第四单元 检测题 115
综合检测题 123
参考答案 131