一、单元综述：
本单元重点是张大嘴巴跟老师一起读，感受美语。练习我们的脸部肌肉，并体会美语发音的方式和技巧。
二、 美语发音：
1、4个双元音
美语音标最大的区别在于其中的元音，过去学过的元音是单元音，但美语中所学的是双元音
1){e｝-{ei｝
age, game, day
sentence: more haste, less speed.欲速则不达
第一步把每个音发准
第二步加上声调
练习: its pay day today 今天是发工资的日子
2){o｝-{ou｝结尾停在u
boat, note, so
美语发音的特点：尽量在口腔的后部把音发出来。
sentence: i hope so.
练习：he posed for a group of photo with his old fellows.
注：美语中常常对a和the进行变音，目的是为了强调
eg：
this is the best opportunity we ever have to enter the market.
3) {a｝-{ai｝
bike, mine, flight
this bike of mine
sentence: all right.
注：all不要卷舌
练习：out of sight, out of mind 眼不见，心不烦
4) how
out, now about
sentence: let s get out of here.
its kind of tough.
its kind of torture to read mathematics everyday.
练习: this is out-and-out power politics. 这是彻头彻尾的强权政治
2、2个后元音
1){半圆两点｝
发音技巧：尽量往最里吞这个音
not, bottle, hot, job, hospital
sentence: its a promise.
练习：little red lorry 红色小卡车
2){u｝
good ,book, should
sentence: shes looking at a good book.
更多例子： new student attitude due
i am for this position.
3、辅音t的发音
writer, letter, better, city,
发音变化一：浊化
浊化原则1：t处在非重读音节要浊化
如：writer, letter, better, city,
浊化原则2：t处在重读音节不能浊化
如：italian, attack, atomic, latino, photographer
浊化对比：
italy, attic(阁楼)
atom(原子), latin, photograph
发音变化二：t在词组中的发音变化：
练习：pick it up
i got it.
right away
发音变化三：t发音的特殊情况：
当t发的很快，就会变成n的音
internet
interview
interesting
representative
发音变化四：失去爆破
right now, just now
发音变化五：t的音从鼻子里出来(美音，英音都有的一种特殊情况)
britain, mountain, fountain
4、r的发音
1)r在单词中的发音
练习: rolly rolled a round roll around the road.
spare, burglar, dirty, porch, more
2)r带动后面元音的发音
world girl pearl
the girls are the pearls in the world.
原则：只有字母r存在才能卷舌
经常发错的音：china, america, idea