Unit 1 Lesson 1 1
Lesson 2 3
Lesson 3 5
Lessons 1—4 8
U nit 2 Lesson 5 12
Lesson 6 14
Lesson 7 16
Lessons 5—8 18
Unit 3 Lesson 9 23
Lesson 10 25
Lesson 11 27
Lessons 9—12 29
Unit 4 Lesson 13 33
Lesson 14 35
Lesson 15 36
Lessons 13—16 39
Unit 5 Lesson 17 43
Lesson 18 45
Lesson 19 47
Lessons 17—20 49
Unit 6 Lesson 21 53
Lesson 22 55
Lesson 23 57
Lessons 21—24 59
Unit 7 Lesson 25 63
Lesson 26 65
Lesson 27 67
Lessons 25—28 69
第一学期期中测试题 73
Unit 8 Lesson 29 79
Lesson 30 81
Lesson 31 83
Lessons 29—32 85
U nit 9 Lesson 33 89
Lesson 34 91
Lesson 35 93
Lessons 33—36 95
Unit 10 Lesson 37 99
Lesson 38 101
Lesson 39 103
Lessons 37—40 105
Unit 11 Lesson 41 109
Lesson 42 111
Lesson 43 113
Lessons 41—44 115
Unit 12 Lesson 45 119
Lesson 46 121
Lesson 47 123
Lessons 45—48 125
Unit 13 Lesson 49 129
Lesson 50 131
Lesson 51 133
Lessons 49—52 136
Unit 14 Lesson 53 141
Lesson 54 143
Lesson 55 145
Lessons 53—56 147
第一学期期末测试题 151
答案 158