练习材料：
Lesson 49 The end of a dream
How did the dream end
Tired of sleeping on the floor, a young man in Teheran saved up for years to buy a real bed. For the first time in his life, he became the proud owner of a bed with springs and a mattress. Because the weather was very hot, he carried the bed on to the roof of his house.He slept very well for the first two nights, but on the third night, the storm blew up. A gust of wind swept the bed off the roof and sent it crashing into the courtyard below.The young man did not wake up until the bed had struck the ground. Although the bed was smashed to pieces, the man was miraculously unhurt.When he woke up, he was still on the mattress. Glancing at the bits of wood and metal that lay around him, the man sadly picked up the mattress and carried it into his house. After he had put it on the floor, he promptly went to sleep again.
任务配置：L0,L1,L4
知识笔记：
1./t/：舌尖抵住上齿龈，堵住气流，然后舌尖离开齿龈，气流冲出口腔，声带不振动。
2./d/：同上，但是声带振动发音
3./tʃ/：舌尖抵住上齿龈后部，形成阻碍，舌两侧抵住上齿龈，嘴唇向前突出，略成圆形，送气，声带不振动。
4./dʒ/同上，声带振动发音
5.carry sth on to :搬到·····，不但有方向，还代表放到上面
6.blow up：风越刮越大，up
7.be confined:被限制
练习感悟：
每次复习音标都会有心得发现，比如t的舌位，应该是抵住上齿龈，而不是上齿。/tʃ/嘴形是略收圆，而不是如/ʃ/，是略呈长方形，而是/tʃ/比/ʃ/多了个t，舌尖是卷起的，/ʃ/舌头平放。这些微小的差别最终都会决定发音的标准性。
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