开头：Good morning everybody!It's my honor to speak here,and I am very glad to share my topic with you. Then today I'd like to talk something
about......（大家早上好！能在这里做此次演讲我十分荣幸，也很高兴能跟大家一起分享我的主题，今天我想演讲的是......）
结尾：OK,thank you for listening,that's all.（好了，谢谢各位的聆听，我的演讲结束了。）
演讲后回答老师提出的3个问题前先说：
Thanks for your questions. I think....再接着发表自己的观点。
