题目内容：

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~

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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...