Unit 1 Getting along with others 1
Welcome to the unit and Reading 2
Word power＆Grammar and usage 14
Task and Project 16
Unit 2 The environment 28
Welcome to the unit and Reading 29
Word power＆Grammar and usage 39
Task and Project 44
Unit 3 Science versus nature 56
Welcome to the unit and Reading 57
Word power＆Grammar and usage 66
Task and Project 71
第一单元 检测题 83
第二单元 检测题 91
第三单元 检测题 99
综合检测题 107
参考答案 115