CONTENTS 1
Lesson 1．Some Forms of Energy 1
The Complex Object and the Complex Subject 13
Lesson 2．Thomas Alva Edison 13
The Subject Clause,the Predicative Clause and the Object Clause 27
Independent Reading 1:Energy 27
Lesson 3．"Eureka!" 30
The Attributive Clause 43
Lesson 4．The Value of Water and Mineral Salts to the Body 43
The Restrictive Attributive Clause and the Non-restrictive Attributive Clause 53
Independent Reading 2:Salt 53
Word-Formation（1） 56
Review Exercises（Lesson 1—Lesson 4） 58
Lesson 5．The Last Lesson（1） 60
The AdverbialClause 1
Lesson 6．The Last Lesson（2） 71
The Adverbial Clause 2
Independent Reading 3:The Story of William Tell 82
Lesson 7．Galileo and the Lamps 87
The Uses of"That","As","Since" 98
Independent Reading 4:Galileo's Famous Experiment 98
Lesson 8．Lenin in Londo 101
The Uses of "It" 112
Independent Reading 5:Rebel Student 112
Word-Formation（2） 117
Review Exercises （Lesson 5—Lesson 8） 119
Supplementary Readings: 121
1What Is Lightning? 121
2．How Is the Human Body Different from a Machine? 123
3．Colour 124
4．InMemory of Norman Bethune 126
5．Fables ofEsop 129
Relerence Material of Phoneties 133
An Outline of Grammar 144
Irregular Verbs 154
Vocabulary 155