Many years ago, when I was working as a volunteer at a hospital, I got to know a little girl named Lisa. The poor little girl had a very serious disease(疾病)and was dying. The doctor had done his best but no medicine really worked. The only chance to save her seemed to be a blood transfusion(输血)from her five-year-old brother. The little boy had the same disease before and had developed the antibodies(抗体)to fight the illness.
The doctor talked to the little boy about what they planned to do, and asked him if he would like to give his blood to his sister. I saw him hesitate(迟疑) for a moment. Then he took a deep breath and said, "Yes, I’ll do it if it can save Lisa."
As the transfusion was going on, the little boy lay quietly in bed next to his sister. He looked at her and smiled all the time. When everything was done and the color returned to his sister’s face, his smile disappeared and he looked a little afraid. He looked up at the doctor and asked, "Will I start to die now?"
He was too young to understand the doctor. He thought he would have to give all his blood to his sister, but he agreed.
What happened to the little girl named Lisa later?

A．She died of a very serious disease.

B．She got better with the antibodies from her brother.

C．She lost her little brother.

D．The transfusion failed and her illness got worse.

How did the five-year-old boy understand the doctor’s plan?

A．He thought he was going to lose all his blood.

B．He thought he was going to be killed.

C．He thought he was going to die together with his sister.

D．He thought he was going to die when he was older.

What did the boy feel when the doctor talked to him about the transfusion?

A．He was unhappy to help his sister.

B．He was so afraid that he refused to do anything.

C．He was worried about his sister.

D．He was willing to give his blood.

The writer still remembers the story after many years ______.

A．because the little girl had a very strange disease

B．because the sister and brother had the same disease

C．because the doctor saved the little girl’s life

D．because of what the boy did for his sister