| 极限体育运动员关心的不是改善自己的身体，而是挑战，挑战身体的极限，在于克限恐惧和做那些别人说不可能的事，在极限运动中，你将会发现一个兴奋和挑战的世界。 |
| 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 |
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