Unit 1
Lesson 1 Fire in Midair
Lesson 2 Into the Flames
Lesson 3 Doctors(and Nurses)Without Borders
Lesson 4 Bass Reeves：Hero of the Wild West
Lesson 5 Avalanche in British Columbia
Lesson 6 The Spy Who Saved Lincoln
Unit Summarizing 1
Unit 2
Lesson 7 The Miracle Mission
Lesson 8 Alone at Sea
Lesson 9 Escape from Iran
Lesson 10 Fearless Reporter
Lesson 11 Nurses on the Front Line
Unit Summarizing 2
Unit 3
Lesson 12 Life and Death：The Crash of Flight 242
Lesson 13 Courage at Knifepoint
Lesson 14 Rescue Mission
Lesson 15 Fallen Heroes
Lesson 16 Terror at the YMCA
Unit Summarizing 3
Appendix
Answer Key
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