Students'Book 3
Unit 1 The presevation of food 3
Unit 2 Refrigeration and refrigerators 11
Unit 3 Spare parts for the human body 22
Unit 4 Plants 31
Unit 5 Animals in danger 39
Revision unit 1 (Units 1-5) 48
Unit 6 From counting to computers 54
Unit 7 Sound and noise 63
Unit 8 Oil 72
Unit 9 The motor car and pollution 79
Unit 10 Tomorrow's world 88
Revision unit 2 (Units 6-10) 95
Teachers'Book 101
Introduction 101
Unit 1 The presevation of food 104
Unit 2 Refrigeration and refrigerators 106
Unit 3 Spare parts for the human body 107
Unit 4 Plants 109
Unit 5 Animals in danger 110
Revision unit 1 (Units 1-5) 112
Unit 6 From counting to computers 112
Unit 7 Sound and noise 114
Unit 8 Oil 116
Unit 9 The motor car and pollution 118
Unit 10 Tomorrow's world 120
Revision unit 2 (Units 6-10) 121
附：词汇表 123