Narration(叙述) 1
Unit 1 1
Unit 2 7
Unit 3 14
Unit 4 20
Unit 5 26
Unit 6 30
Unit 7 35
Description(描述) 40
Unit 8 40
Unit 9 47
Unit 10 54
Unit 11 58
Unit 12 61
Unit 13 64
Unit 14 67
Unit 15 70
Unit 16 74
Unit 17 80
Unit 18 88
Unit 19 96
Exposition(说明) 104
Unit 20 104
Unit 21 112
Unit 22 115
Unit 23 118
Unit 24 120
Unit 25 127
Unit 26 135
Argumestion(议论) 142
Unit 27 142
Unit 28 150
Unit 29 157
Unit 30 165