求一篇英文的说明性演讲稿
问题描述：
求一篇英文的说明性演讲稿
随便什么主题都可以~老师没说。大概在3分钟之内可以讲完~
答
什么主题?什么字数?什么时候要?PENICILLIN-Wonder DrugMedicines have changed people's lives.If you open up any medicine cupboard in the world,there is a high probability that you will find penicillin,whi...