4．
阅读下面短文，从每题所给的A、B、C、D四个选项中选出能正确回答所提问题或完成所给句子的最佳答案。
I'll never forget the little boy called Dick. At that time, I worked in a hospital. There was a little girl. She was badly ill. The only chance to make her healthy again was a blood transfusion (输血) from her five-year-old brother Dick.
The doctor told the boy about that and asked whether (是否) he would like to give his blood to his elder sister. Thinking of his sister, he thought for a moment, and took a deep breath. He said, "Yes, I will do this, if it saves her life."
The moment came. His sister was lying on the bed next to him. The boy looked at her and smiled, but gradually his face became pale and his smile disappeared. He asked the doctor in a low voice, "Doctor, will I start to die right now?"
The doctor smiled and said, "Of course not. You'll be stronger than before soon."
The little boy thought that if he saved his sister, he would die, but he still chose to save her. What a brave boy!
