目录 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
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