More than a hundred years ago, a college student was travelling by train.He found himself 1 by the side of an old man who seemed to be a 2 peasant, well dressed.He was holding a rosary(念珠)to 3 and moving the beads(珠子)with his fingers.“Sir, do you still 4 such outdated things?”asked the student.“Yes, I do.Don't you?”asked the man.The student burst into 5 and said,“I do not believe in such 6 things.Take my advice, 7 the rosary out of this window, 8 learn what science has to say about it.”
“Science?I do not understand this science.Perhaps you can 9 it to me.”The man spoke humbly(谦恭地)with 10 in his eyes.
The student saw that the man was 11 moved.So to avoid further hurting the 12 of the man, he said,“Please give me your 13 and I will send you some books to 14 you learn about this.”The man 15 the inside pocket of his coat for a moment and gave the boy his visiting card. 16 glancing at the card, the student 17 his head in shame and became 18 .On the card he read,“Louis Pasteur, Director of the Institute of Scientific Research, Paris”.
19 , Louis Pasteur was a great French scientist.His 20 that most diseases are caused by germs(细菌), known as the“germ theory of disease”, was one of the most important advances in medical history.