A famous doctor once received a little child who was badly ill. Thanks to his skill and care, his young patient got well and was soon able to get up and run about again.
The child's mother was very much obliged（感谢的） to the doctor, and she called on him to thank him for what he had done for her child. "Doctor," she said, "you have saved my little son. I don't know how to thank you enough. I feel that money alone cannot repay（回报） you, so I have made this little purse with my own hands, as a sign of my gratitude. I hope you will accept it." The doctor stood up and said coldly, "Madam, a little present like that is very nice between friends, but a doctor needs to be paid properly for what he has done." The lady was so surprised and hurt so much that she could not reply for a moment. Then she said quietly, "Perhaps you will tell me how much your fee is?"
"Fifty pounds", he answered.
The lady opened the little purse and took out four fifty-pound bank notes. She handed one of them to the doctor, and put the other three back into the purse. She put the purse into her handbag and, saying good bye to the doctor, went out of the room.
The lady was thankful to the doctor because ________.

A．he had saved her life

B．he had saved her son's life

C．he had lent her some money

D．he often called on her

The doctor refused the lady's purse because he thought ______.

A．the purse should be given between friends

B．the purse was too small

C．the lady was not kind to him

D．the lady just gave him that purse and wouldn't give him the medical fee

The money in the purse _______.

A．was only 150 pounds

B．was less than 200 pounds

C．was much more than the medical fee

D．was not enough for the medical fee