目录 Unit 1 Advertisement Unit 2 Education Unit 3 Technology Unit 4 Art Unit 5 Story Unit 6 Social Service Unit 7 Social Manner Unit 8 School life Unit 9 Environment Unit 10 Emotion Unit 11 Travel Unit 12 Animals Protection Unit 13 Invention Unit 14 Health Unit 15 Anecdotes and news Unit 16 People Unit 17 The influence of technology Unit 18 Transportation Unit 19 Life Unit 20 Energy Unit 21 Friendship Unit 22 Social culture Unit 23 Economy Unit 24 Family Story Unit 25 Others 答案与解析
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