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chapter1 иÅÄîÓ¢ÓïµÚ1²áµ¥´Ê´ó¼¯ºÏ
unit 1 lesson 1¡«4
unit 2 lesson 5¡«8
unit 3 lesson 9¡«12
unit 4 lesson 13¡«16
unit 5 lesson 17¡ª20
unit 6 lesson 21¡«24
unit 7 lesson 25¡«28
unit 8 lesson 29¡«32
unit 9 lesson 33¡«36
unit 10 lesson 37¡«40
unit 11 lesson 41¡«44
unit 12 lesson 45¡«48
unit 13 lesson 49¡«52
unit 14 1 lesson 53¡«56
unit 15 lesson 57¡«60
unit 16 lesson 61¡«64
unit 17 lesson 65¡«68
unit 18 lesson 69¡«72
unit 19 lesson 73¡«76
unit 20 lesson 77¡«80
unit 21 lesson 81¡«84
unit 22 lesson 85¡«88
unit 23 lesson 89¡«92
unit 24 lesson 93¡«96
unit 25 lesson 97¡«100
unit 26 lesson 101¡«104
unit 27 lesson 105¡«108
unit 28 lesson 109¡«112
unit 29 lesson 113¡«116
unit 30 lesson 117¡«120
unit 31 lesson 121¡«124
unit 32 lesson 125¡«128
unit 33 lesson 129¡«132
unit 34 lesson 133¡«136
unit 35 lesson 137¡«140
unit 36 lesson 141¡«144
chapter 2 иÅÄîÓ¢ÓïµÚ2²áµ¥´Ê´ó¼¯ºÏ
unit 1 lesson 1¡«3
unit 2 lesson 4¡«6
unit 3 lesson 7¡«9
unit 4 lesson 10¡«12
unit 5 lesson 13¡«15
unit 6 lesson 16¡«18
unit 7 lesson 19¡«21
unit 8 lesson 22¡«24
unit 9 lesson 25¡«27
unit 10 lesson 28¡«30
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chapter 3 иÅÄîÓ¢ÓïµÚ3²áµ¥´Ê´ó¼¯ºÏ
chapter4 иÅÄîÓ¢ÓïµÚ4²áµ¥´Ê´ó¼¯ºÏ