20160819—G72

新内容：
1. 容易混淆的元⾳音
1) [æ] [e]—bad bed; had head; man men; land lend; pan pen;
sad said
2) [i:] [ei]—real rail; greet great; mean main; read raid
3) [e] [ai]—bet bite; red ride; said side; head hide
4) [au] [ɔ:]—house horse; loud lord; south sauce; cloud clause;
now nor; brown, born
5) [au] [ʌ]—found fond; down done; gown gun; town ton


日常英语部分：
今天我们要学习一些蔬菜的名字
西红柿tomato  黄瓜cucumber  洋葱onion  大蒜garlic  青椒green pepper 
红椒red pepper  玉米corn  南瓜pumpkin  土豆potato  芹菜celery  
香菇mashroom