Build Up Reading Level 4

Unit 01 Bacteria's Help to Humanity
Unit 02 The Lascaux Cave Paintings
Unit 03 The Origins of the Guitar
Unit 04 An Ice Skater's Special Skill
Unit 05 Jessye Norman
Unit 06 The History of the Olympics
Unit 07 The Difference Between Left- and Right-Handed People
Unit 08 France's Gift to the United States
Unit 09 The Birth of Potato Chips
Unit 10 The Probability of a Second Ice Age
Unit 11 The Man Behind the Camera: Steven Spielberg
Unit 12 Hospitality as a Business
Unit 13 The Magical Food
Unit 14 The Making of Fireworks
Unit 15 The Environment Inside a Volcano
Unit 16 The Study of Garbage
Unit 17 A Recipe for Homemade Paper
Unit 18 The SETI Project
Unit 19 Salsa: The Spice of Cuba
Unit 20 The Saint of the Gutters