1, the boy and his sister live alone. Her parents died young, and she was his only relative. So boys love their sisters and themselves. However, it happened to these two unfortunate children again. My sister is very ill and needs blood transfusion. But the blood in the hospital is too expensive, and the boy has no money to pay any fees. Although the hospital exempted the operation fee, his sister would still die without blood transfusion.

As my sister's only relative, this boy's blood type matches my sister's. Ask the boy if he is brave and has the courage to bear the pain when drawing blood. The boy began to hesitate. 10-year-old brain finally nodded after some thinking.

When drawing blood, the boy quietly didn't make a sound, just smiled at his sister in the next bed. After drawing blood, the boy asked in a trembling voice, "Doctor, how long can I live?"

The doctor wanted to laugh at the boy's ignorance, but he was shocked: in the brain of the boy 10, he thought that blood transfusion would lose his life, but he was still willing to donate blood to his sister. At that moment, the boy decided to be brave all his life and make up his mind to die. The doctor's palms are sweating. He held the boy's hand tightly and said, "don't worry, you won't die." Blood transfusion will not lose life. "

5. The boy's eyes sparkled: "Really? Then how many years can I live? " The doctor smiled and said lovingly, "You can live to be 100 years old, young man, you are very healthy!" " "The boy jumped and jumped for joy. After confirming that he was really okay, he rolled up his arm again-the arm that had just been bleeding, raised his head and solemnly said to the doctor, "Then give half my blood to my sister, and each of us will live for 50 years!" Everyone cried. This is not a child's unintentional promise. This is the most selfless and pure promise of human beings.