Unit 1 元音字母a,e,i,o,u的发音规则 第一单元 神奇的果园 Lesson One a [?] A Rat's Foreign Language老鼠的外语 Lesson Two a [ei] It Is Part of the Game这是游戏的一部分 Lesson Three e [e] The Best Present最好的礼物 Lesson Four i [i] I Have His Ear in My Pocket他的耳朵还在我衣兜里呢 Lesson Five i [ai] My Do