Unit 1
Lesson 1 Street Luge：Fast，Fun，…Dangerous!
Lesson 2 Snowboarding Out of Bounds
Lesson 3 Bungee Jumping
Lesson 4 White-Water Thrills
Lesson 5 Hang Gliding
Lesson 6 Climbing the World’s Highest Mountains
Unit Summarizing 1
Unit 2
Lesson 7 The Wodd’S Wildest Horst Race
Lesson 8 Skiing the Impossible
Lesson 9 Race Through the Sand
Lesson 10 Stunt F1ying
Lesson 11 The Last Great Race on Earth
Unit Summarizing 2
Unit 3
Lesson 12 Conquering Niagara Falls
Lesson 13 Extreme Biking
Lesson 14 Buzkashi：War on Horseback
Lesson 15 BASE Jumping
Lesson 16 Raid Gauloises：10 Days of Hell
Unit Summarizing 3
Appendix
Answer Key
