Unit 1 Social Customs 1
Unit 2 Weather 19
Unit 3 Social Issues 37
Unit 4 Literature 57
Unit 5 Education 77
Unit 6 Work 93
Unit 7 People 115
Unit 8 News(Ⅰ) 137
Unit 9 Language 159
Unit 10 History 179
Unit 11 Nature 199
Unit 12 Geography 221
Unit 13 Money 239
Unit 14 Science and Technology 257
Unit 15 News(Ⅱ) 281