Do you know the boy in the picture? He is Yi Yangqianxi. His English name is Jackson. Yi is 15 years old. He is a student in a school in Beijing. And he is also a boy in the group (组合) TFBOYS.

    TFBOYS has three boys — Wang Yuan, Wang Junkai and Yi Yangqianxi. All of them are tall and have good looks. They are good at dancing and singing.

    Wang Yuan and Wang Junkai are Yi's friends. And Yi has another (另一个) friend. He is a toy bear. He lives in Yi's schoolbag. Yi goes to school with him every day. He talks and plays with him. “He can't talk, but he can listen to me. He is very nice. I like him very much,” Yi says. “I don't want to be away from him.”

    About three years ago, I felt very ____.I didn't like my classmates ,my parents or anyone else. My classmates didn't want to talk ____ me and my parents were always saying that other kids were better than me .I thought I was the most unlucky person in the world.

    One day I had a big fight with one of my ____. I was so angry that I hit him in the face .Just at the moment ,a boy stood up and stopped the fight .He was the ____ of our class. After that ,he often helped me and we ____ good friends . Whenever (无论什么时候) I got angry or sad ,he would help me to ____ down .My life begins to change because of the boy ,my best friend .We ____ a lot of interesting days together . As time goes by ,I become happier with people and things and get along well with everyone here .And it ____ that people around me change , too. My parents don't shout at me any more and my classmates become friendly to me .

    But now I can't often see my best friend ____ he is seriously ill and is staying in hospital .How I miss the days when we were together ! I hope he will be ____ and come back to school soon.

方程x=x（x﹣1）的根是（　　）

 如图甲所示，当用指甲剪剪指甲时，指甲剪可以看成是多个杠杆的组合．乙中画出剪指甲时其中一个杠杆DBE的动力臂L₁和阻力F₂

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