2014高中英语(牛津译林版必修3,安徽专用)同步课件:Unit 2 Language Section ⅠWelcome to the unit,Reading
2014高中英语(牛津译林版必修3,安徽专用)同步课件:Unit 2 Language Section ⅠWelcome to the unit,Reading第4页

enjoyment, and that by six months they are able to add new words to their store. This self­imitation leads on to deliberate imitation of sounds made or words spoken to them by other people.