Unit 1 Getting along with others 2
Welcome to the unit＆Reading 2
Word power＆Grammar 11
Task＆Project 19
单元自主检测 28
Unit 2 The environment 36
Welcome to the unit＆Reading 36
Word power＆Grammar 47
Task＆Project 56
单元自主检测 64
Unit 3 Science versus nature 72
Welcome to the unit＆Reading 72
Word power＆Grammar 82
Task＆Project 89
单元自主检测 97
参考答案 105