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内容简介
Lesson One
Unit One
Lesson Two
Lesson Three
Lesson One—Lesson Three
Unit Two
Lesson One
Lesson Two
Lesson Three
Lesson One—Lesson Three
Mid-exam
Lesson One
Unit three
Lesson Two
Lesson Three
Lesson One—Lesson Three
Unit Four
Lesson One
Lesson Two
Lesson Three
Lesson One—Lesson Three
Final-exam
Listening Tapeseripts and the Keys to the Lessons
