从题中所给的A、B、C、D四个选项中选出能填入空白处的最佳选项。

Do you know the man in the picture? His name is Zhong Nanshan. He is a great doctor from China and he1many people's lives.

We all know that SARS and COVID-19 are2diseases （疾病）. Many people got sick （生病的） because of them3some lost their lives. Quite a lot of people were4of SARS and COVID—19. But Zhong was brave （勇敢的） to fight5.

Zhong often went to see the sick people in hospital. He also6days and nights studying SARS and COVID-19. At last, he7some good ways to fight the diseases. In these8 ， many sick people got well.

People thank Zhong very much for his help. But he9says, "I am just a doctor. "

10a great doctor!