今天我们要学习的是：前元音/ε/[e]和/æ/
前元音/ε/[e] 的发音要领：
前元音/ε/[e] 发音的时候，舌尖抵下齿，舌的前部稍微抬起，但是，舌位要低于上节课所学的/ I /，上下齿的宽度要容得下一个手指，气流呼出短促而有力。
提醒：
发音时注意别把 man 读成了“闷” 。
别把pen 读成了 “盆” 。
前元音//的发音要领：
//发音时，舌尖轻触下赤， 比/ε/的口型要大，下颌下拉。
提醒：
别把单音的//发成了/ ai / 。
出现在讲解中的练习：
单词练习：
bed, bad, get, gap, head, hat, lend, land, met, map, pet, pack, smell, smash, test, task, wet, wax
词组、短语练习：
cash desk, half the battle, a letter to a friend, get the sack, the weatherman said, half as many again, go cap in hand, catch him red-handed, as well be hanged for a sheep as for a lamb
句子练习：
Send him back.
That settles it.
I'll check you later.
Let's check in at a hotel.
He let the cat out of the bag.
It's not the end of the world if you fail that test.
Only graduate students have access to the library shelves.
One man's trash is another man's treasure.
