题目

点A、B在数轴上的位置如图所示． （1） 点A表示的数是，点B表示的数是； （2） 若点C在数轴上，且线段 ，求线段 的长． 答案：【1】-4【2】1 解：设点C表示的数为 x ，∵BC=8， ∴ |x−1|=8 ， 解得： x1=9，x2=−7 ， 当点C表示的数为 9 时，AC= |9−(−4)|=13 ， 当点C表示的数为 −7 时，AC= |−7−(−4)|=3 ， 答：线段AC的长为13或3．Many years ago，when I was working as a volunteer(志愿者)at a hospital, I got to know a little girl named Lisa. The poor little girl had a very serious disease and was dying. The doctor had done his best but no medicine really worked. The only chance to save her seemed to be a bloodtransfusion(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 be willing(愿意的)to give his blood to his sister. I saw him hesitate(迟疑)for a moment. 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 1ooked at her and smiled all the time. When everything was done and the colour returned to his sister’s face, his smile disappeared and he looked a little afraid. He 1ooked 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.小题1:What happened to the 1ittle girl named Lisa?A．She died of a very serious disease.B．She would get better with the antibodies from her brother.C．She lost her little brother.D．The transfusion failed and her illness got worse.小题2:The doctor waited the little boy to_________.A．give all his blood to his sisterB．give some of his blood to his sisterC．give his life to his sisterD．get the same disease as his sister小题3:How did the five-year-o1d 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 grew up.小题4:The writer still remember the story many years later_________.A．because the little girl had a very strange diseaseB．because the sister and brother had the same diseaseC．because the doctor saved the little girl’s lifeD．because of what the boy did for his sister