阅读理解。
请阅读下面的故事,按情节的先后,把图片排序,并将其字母代号A、B、C、D、E分别填入1~5处.
Once upon a time there was a little boy named Jack living in an orphanage(孤儿院). He always wished that
he could fly like a bird.
One day, Jack came to a park and saw a cripple(瘸的) boy. He ran over to the boy and asked him if he
wanted to fly like a bird. But the little boy said he only wanted to walk and run like other boys and girls. Jack
felt a little sad. He asked the crippled boy if they could be friends. The boy agreed and the two little boys played
for hours. Then the crippled boy's father came to pick up his son. Jack ran over to the boy's father and said
something to him. Then Jack said to his new friend,"You are my only friend. I can't make you walk and run.
But I can do something else for you." Jack turned around and told his new friend to move onto his back. He
then began to run faster and faster across the park.
The little boy's father began to cry as he watched his beautiful crippled son waving his arms in the wind and yelling(欢呼),"I'm flying, Daddy. I'm flying!"
A B C D E
1. ___________→2. ___________→3. ___________→4. ___________→5. ___________
有相同的焦点，它的一条渐近线为y=-x，则双曲线方程为().