Unit 1 Animals and Humans
Unit 2 Challenges and Obstacles
Unit 3 Surprises
Unit 4 Food
Unit 5 Entertainment
Unit 6 The Young and the Old
Unit 7 Science and Technology
Unit 8 Mysteries of Nature
Unit 9 Commerce and Business
Unit 10 Communicate and Media
Unit 11 Society
Unit 12 Men and Women
Unit 13 Events
Unit 14 Personality and Preference
Unit 15 Life and Health
Unit 16 Nature
Unit 17 People Around the World
Unit 18 Study and Education
Unit 19 Profession and Work
Unit 20 Psychology and People
Unit 21 Travel
Unit 22 Sports
Unit 23 Social Life
Unit 24 Tradition and Habits
Unit 25 Development
Keys
Appendix：Tapescripts
