第三级 3
Lesson 1 3
Lesson 2 6
Lesson 3 9
Lesson 4 12
Lesson 5 15
Lesson 6 18
Lesson 7 21
Lesson 8 24
Lesson 9 28
Lesson 10 31
Lesson 11 34
Lesson 12 37
Lesson 13 40
Lesson 14 43
Lesson 15 46
Lesson 16 49
Lesson 17 53
Lesson 18 56
Lesson 19 59
Lesson 20 63
Lesson 21 66
Lesson 22 69
Lesson 23 72
Lesson 24 75
Lesson 25 78
Lesson 26 81
Lesson 27 84
Lesson 28 87
Lesson 29 91
Lesson 30 94
Key to Comprehension Questions 97
第四级 101
Lesson 1 101
Lesson 2 105
Lesson 3 108
Lesson 4 111
Lesson 5 114
Lesson 6 117
Lesson 7 120
Lesson 8 123
Lesson 9 126
Lesson 10 129
Lesson 11 132
Lesson 12 135
Lesson 13 138
Lesson 14 141
Lesson 15 144
Lesson 16 146
Lesson 17 151
Lesson 18 154
Lesson 19 157
Lesson 20 160
Lesson 21 163
Lesson 22 167
Lesson 23 170
Lesson 24 173
Lesson 25 176
Lesson 26 179
Lesson 27 182
Lesson 28 185
Lesson 29 188
Lesson 30 191
Key to Comprehension Questions 194