Li Shizhen was born in 1518．His father was a person who was interested in Chinese medicine．Li Shizhen often saw that people fell ill．He decided to study medicine so that he could help people who were ill．

Li Shizhen read many books about medicine．He found that many of the old medical books were full of mistakes．So his wish was to write a new one．

He did his best to study medical science．He studied not only herbs（草药）in his own garden，but also the wild ones．He set out to collect herbs and talk with old peasants．He learned a lot from curing（治疗） patients．

After many years of hard work and study，Li Shizhen finished his great work Ben Cao Gang Mu （《本草纲目》）．At that time he was sixty．His book is now one of the greatest contributions of the Chinese people to the medical science of the world．

76．Li Shizhen's father was 　　in Chinese medicine．

77．Li Shizhen decided to study medicine because he wanted to help the 　　people．

78．Li Shizhen found that there were some 　　in the old medical books．

79．Ben Cao Gang Mu is a book about 　　．

80．Li Shizhen made great 　　to people all over the world in the medical field．