Li Shizhen was one of the most famous doctors in Chinese history.He was born in Hubei in 1518.
    Li Shizhen was born in a family of doctors.His father wrote several books about Chinese medicine.Li Shizhen loved medicine very much at an early age and used to help his father in his medical practice.But at that time，doctors led a difficult life.His father wanted him to be an officer.Li Shizhen studied hard for imperial examination（科舉考試），he went to Wuchang three times to take the exams，but failed.When he was 23，he decided to learn medicine from his father.
    When he was 38，he cured the son of the Prince of Chu and was invited to be an officer.Even though his father's dream came true，he was unhappy.One year later，he returned to be a doctor again.
    He found there were some mistakes in the old medical books.So he made up his mind to write a new book in 1552.He overcame many difficulties and finished the book in 1579.
    Compendium of Materia Medica《本草綱目》，with 1.92 million words，is a great medical work.Unluckily，Li Shizhen died before the book was officially published.

（1）Li Shizhen was well-known as

a

a

doctor

doctor

.
（2）He decided to learn medicine from his father

at

at

twenty-three

twenty-three

.
（3）Li Shizhen decided to write a new book because there were

some

some

mistakes

mistakes

in old ones.
（4）It took Li Shizhen

27

27

years

years

to finish the book Compendium of Materia Medica.
（5）There are

1.92

1.92

million

million

words in Compendium of Materia Medica.