Lesson 1．Education Today 1
Lesson 2．How Yu Kung Removed the Mountains 10
Lesson 3．What Is the Scientific Method? 21
Lesson 4．What Is Heat? 33
Independent Reading 1:Doing Physical Labour with Lenin 45
Word-Formation(1) 50
Review Exercises(Lesson 1-Lesson 4) 52
Lesson 5．New Methods of Computation 55
Lesson 6．Science in Action 70
Independent Reading 2:China's First Atomic Reactor and Cyclotron 81
Lesson 7．Artificial Satellites and Space Rockets 84
Lesson 8．The World's First Compass 96
Independent Reading 3:Motions of the Moon 107
Word-Formation(2) 110
Review Exercises(Lesson 5-Lesson 8) 111
Lesson 9．M．V．Lomonosov 115
Lesson 10．A New Era of Man's Entry into Space Has Begun！ 129
Independent Reading 4:Talks between Yuri Gagarin and Correspondents during an Interview(An Excerp) 143
Word-Formation(3) 147
Review Exercises(Lesson 9-Lesson 10) 148
Lesson 11．Work and Rest(An Excerpt) 151
Lesson 12．A Letter to the Youth 161
Independent Reading 5:"This Belongs to Chu Teh" 171
Supplementary Readings: 175
1．A Few Things about Karl Marx 175
2．Water 176
3．Atomic Energy 177
Reference Material of Phonetics 180
An Outline of Grammar 195
Irregular Verbs 200
Vocabulary 203