An Unforgettable Lesson Two years ago, we had our first experiment The professor put a glass of urine on the table, and told us to observe He put one finger into the second glass and then put it into his God! That was urine! What he said next shocked all of us — “Do what I just did, one by ” We were forced to do as he At last, the professor said, “None of you see carefully In fact, the finger I put into my mouth was not the one that I had put into the But you all ignored this ” Never did I forget this 纯属原创,但不知道你是哪个年级的学生是否适用。望采纳!