目录Unit Thirteen 1
Lesson 49 1
Lesson 50 2
Lesson 51 3
Lesson 52(Revision) 4
Unit Fourteen 11
Lesson 53 11
Lesson 54 12
Lesson 55 13
Lesson 56(Revision) 14
Unit Fifteen 20
Lesson 57 20
Lesson 58 21
Lesson 59 22
Lesson 60(Revision) 23
Lesson 61 30
Unit Sixteen 30
Lesson 62 31
Lesson 63 32
Lesson 64(Revision) 33
Unit Seventeen 38
Lesson 65 38
Lesson 66 39
Lesson 67 40
Lesson 68(Revision) 41
Unit Eighteen 47
Lesson 69 47
Lesson 70 48
Lesson 71 49
Lesson 72(Revision) 50
期末模拟考试（A卷） 55
期末模拟考试（B卷） 62
部分参考答案 69