CONTENTS 1
Lesson 1 Text:What Is Science? 1
Lesson 2 Text:The First Electric Light 8
Lesson 3 Text:Metals 17
Lesson 4 Text:Dust 25
General Review Ⅰ （Lessons 1—4） 39
Lesson 5 Text:Heat from the Sun 44
Lesson 6 Text:Newton and the Problem of Gravitation（Ⅰ） 50
Lesson 7 Text:Newton and the Problem of Gravitation（Ⅱ） 58
Lesson 8 Text:Archimedes and the Crown 67
General Review Ⅱ （Lessons 5—8） 75
Lesson 9 Text:Cables,Conductors and Insulators 80
Lesson 10 Text:Incandescent and Fluorescent Lamps 91
Lesson 11 Text:Expansion and Contraction 98
Lesson 12 Text:A Letter to the Youth 107
General Review Ⅲ（Lessons 9—12） 114
Lesson 13 Text:The Indomitable Curie（1） 117
Lesson 14 Text:The Indomitable Curie（2） 126
Appendix Ⅰ Idioms and Phrases 139
Ⅱ Vocabulary 141