Lesson 1 The Alphabet Lesson 2 A E I O U Lesson 3 The Sound of A Lesson 4 The Sound of E Lesson 5 The Sound of I Lesson 6 The Sound of O Lesson 7 The Sound of U Lesson 8 [tr],[dr] Lesson 9 Short A Lesson 10 Short E Lesson 11 Short I Lesson 12 Short O Lesson 13 Short U Lesson 14 A Review of [w],[h],[m],[n],[l],and [j] Lesson 15 The Sound of [a:] 句子参考译文 思考问题解答 附录 VOCABULAKY · · · · · · (收起)