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CONTENTS 1

Lesson One Page 1

Part 1:A Journey to the Centre of the Earth 1

Part 2:Conversation:Unit 1:The Best Laid Plans,Part 1 15

Lesson Two 20

Part 1:An Observer from a Foreign Planet 20

Part 2:Conversation:Unit 1:The Best Laid Plans,Part 2 30

Lesson Three 37

Part 1:David and Goliath 37

Part 2:Conversation:Unit 1:The Best Laid Plans,Part 3 49

Part 1:Butter 56

Lesson Four 56

Part 2:Conversation:Unit 1:The Best Laid Plans,Part 4 69

Lesson Five 77

Part 1:The Story of the Potato 77

Part 2:Conversation:Unit 1:The Best Laid Plans,Part 5 90

Lesson Six 98

Part 1:The Whistle 98

Part 2:Conversation:Unit 2:The Count's Revenge,Part 1 110

Lesson Seven Page 117

Part 1:Edison's Early Life 117

Part 2:Conversation:Unit 2:The Count's Revenge,Part 2 129

Part 1:Schweitzer 135

Lesson Eight 135

Part 2:Conversation:Unit 2:The Count's Revenge,Part 3 144

Lesson Nine 149

Part 1:Hydroponics is the Answer to a Future Shortage of Food 149

Part 2:Conversation:Unit 2:The Count's Revenge,Part 4 162

Lesson Ten 167

Part 1:Heat and Its Effects 167

Part 2:Conversation:Unit 2:The Count's Revenge,Part 5 177

Lesson Eleven 181

Part 1:Hansel and Gretel（Ⅰ） 181

Part 2:Conversation:Unit 2:The Count's Revenge,Part 6 196

Part 1:Hansel and Gretel（Ⅱ） 202

Lesson Twelve 202

Part 2:Conversation:Unit 2:The Count's Revenge,Part 7 217

Lesson Thirteen 222

Part 1:The Voice 222

Part 2:Conversation:Unit 2:The Count's Revenge,Part 8 237

Lesson Fourteen 244

Part 1:On Not Answering the Telephone 244

Part 2:Conversation:Unit 2:The Count's Revenge,Part 9 257

Lesson Fifteen 263

Part 1:Automation 263

Part 2:Conversation:Unit 2:The Count's Revenge,Part 10 274