短元音:book,cook,look,hook,took
长元音:food,good,mood,wood,room,broom,groom,loom,bloom,doom,fool,cool,pool,tool,wool,root,boot ,foot,roof,hoof,poof
短元音:book,cook,look,hook,took
长元音:food,good,mood,wood,room,broom,groom,loom,bloom,doom,fool,cool,pool,tool,wool,root,boot ,foot,roof,hoof,poof