Students'Book 3
Unit 1 How do scientists work? 3
Unit 2 Classification 10
Unit 3 The power of water 19
Unit 4 Water power 25
Revision unit 1 (Units 1-4) 32
Unit 5 Two vital elements 35
Unit 6 Water pollution 42
Unit 7 Jet propulsion 48
Unit 8 Our neighbours in space 55
Revision unit 2 (Units 5-8) 63
Unit 9 The uses of mathematics 68
Unit 10 The weather 74
Unit 11 The power of the lens 83
Unit 12 Rocks 91
Revision unit 3 (Units 9-12) 99
Introduction 107
Teachers'Book 107
Unit 1 How do scientists work? 110
Unit 2 Classification 111
Unit 3 The power of water 113
Unit 4 Water power 115
Revision unit 1 (Units 1-4) 117
Unit 5 Two vital elements 117
Unit 6 Water pollution 118
Unit 7 Jet propulsion 120
Unit 8 Our neighbours in space 121
Revision unit 2 (Units 5-8) 122
Unit 9 The uses of mathematics 123
Unit 10 The weather 125
Unit 11 The power of the lens 127
Unit 12 Rocks 129
Revision unit 3 (Units 9-12) 132
附：词汇表 135
专有名词 140