Unit 1 History of Aviation Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 2 Aircraft Structure Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 3 Air Traffic Control Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 4 Aircraft Weight and Balance Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 5 Airport Delay Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 6 Airport Collaborative Decision Making Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 7 Airport Emergency Plans Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 8 Navigation System Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 9 Automated Dependent Surveillance-Broadcast Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 10 National Airspace System Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 11 Flight Plan Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 12 Visual Flight Rule and Instrument Flight Rule Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 13 Human Factors Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 14 Risk Management Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 15 Airline Pilots Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 16 Meteorology Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 17 Aircraft Fuel Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading Unit 18 Future of Civil Aviation Ⅰ Reading Text Ⅱ Words and Expressions Ⅲ Exercises Ⅳ Supplement Reading KEYS FOR EXERCISES