单项选择题
A．to make a living B．to prevent the dog from rabies C．to find a good way to cure rabies D．to protect children from mad dogs
A．Louis was famous for his discovery. B．Though his left arm and leg were disabled, he worked even harder than before. C．In his childhood he made up his mind to become a doctor. D．His disabled (残疾的)left arm and leg had nothing to do with the mad dogs.
A．a degree which is the highest in science B．a person who works in the lab C．the post in science D．someone whose job is to make sick people well again