Unit 1 The Thousand and One Nights 1
Unit 2 If You Go to the Moon 5
Unit 3 Chimpanzee--The Smart Ape 9
Unit 4 The Legend of Atlantis 13
Unit 5 The Gift of Language 17
Unit 6 Why Did the Dinosaurs Die out？ 21
Unit 7 Fossils 25
Unit 8 What Is Everything Made of？ 30
Unit 9 Are There Any Real Monsters？ 34
Unit 10 Skeleton in the Closet 39
Unit 11 Dynamite--The Stick That Explodes 43
Unit 12 Wales 48
Unit 13 The Mystery of Sleep 52
Unit 14 Is There Life on Mars？ 56
Unit 15 Apple Polisher 60
Unit 16 Anecdotes of Galileo Galilei 65
Unit 17 The Sickness of Change 69
Unit 18 Our Limited Ocean 74
Unit 19 Scotland 78
Unit 20 The Wonderful World of Animals 83
Unit 21 Retirement 87
Unit 22 Cool Science on Antarctica 92
Unit 23 They Have Ways of Making You Spend 96
Unit 24 Swords from the Sky 101
Unit 25 Kennedy and Nixon: The Untold Story 105
Key to Comprehension Questions 110
英语音标 119