Unit 1 Building the future 1
Section Ⅰ Welcome to the unit＆Reading 2
Section Ⅱ Word power＆Grammar and usage 9
Section Ⅲ Task＆Project 14
Unit 2 People on the move 26
Section Ⅰ Welcome to the unit＆Reading 27
Section Ⅱ Word power＆Grammar and usage 33
Section Ⅲ Task＆Project 37
Unit 3 Protecting ourselves 51
Section Ⅰ Welcome to the unit＆Reading 52
Section Ⅱ Word power＆Grammar and usage 58
Section Ⅲ Task＆Project 62
Unit 4 Law and order 73
Section Ⅰ Welcome to the unit＆Reading 74
Section Ⅱ Word power＆Grammar and usage 78
Section Ⅲ Task＆Project 81
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