My friend Karen and I were always together. Karen was only a few months older than I. I always thought she was so beautiful, with long hair and blue eyes. I loved Karen so much because she liked me for being the way I was. I could be myself and share my secrets with her and I never felt like I was being judged.
We had so much fun and were really quite silly. One time I asked my mom to make us the same dresses so we could pretend we were twins.
We continued as best friends throughout grade school. One day, Karen was going to another friend’s place and asked me to come along, but I couldn’t go because I had a babysitting job that afternoon. We walked together to the Becker’s home where I was to babysit and then she continued on her way without me. We had agreed that I would meet her at the corner when she returned and I finished my job.
At four o’clock I rushed to the corner so I wouldn’t be late for meeting Karen. Just as I arrived at the corner, I saw Karen crossing the street. In a second it happened. I saw Karen’s body fly up in the sky. A car had hit her！
Karen was on life support for a week before it was decided that they would allow her to go in peace. Karen’s parents wanted to donate her organs(器官)to the hospital, but there was nothing left healthy enough to be used because she was hit so hard.
I have never got so close to another person since Karen died. I do miss her! Do you cherish(珍惜)your friends? If you don’t, please do, as you may lose them one day.
小题1:What’s the best title for the passage?
A．A horrible car accident
B．An unforgettable experience
C．My dearest friend—Karen
D．An unforgettable girl小题2:When Karen was hit by a car, she was .
A．on her way to a friend’s place
B．on her way to the Becker’s home
C．shouting to the writer who was so far from her
D．heading to the corner where she and the writer would meet小题3:Why were Karen’s organs unable to be donated?
A．Because her parents refused to do that.
B．Because all of her organs were seriously damaged.
C．Because the doctors thought it was too cruel.
D．Because no patients needed organs in the hospital then.小题4:What does the writer suggest we do?
A．Cherish our friends.
B．Accept the fact that people die.
C．Be careful when crossing the street.
D．Never be too close to someone.
时，上升的最大高度记为h。重力加速度大小为g。物块与斜坡间的动摩擦因数和h分别为（ ）
－1）tanθ和
