如图，身高为1.6m的某学生想测量一棵大树的高度，她沿着树影BA由B到A走去，当走到C点时，她的影子顶端正好与树的影子顶端重合，测得BC=4m，CA=1m，则树的高度为（　　）

She       tennis in the school team. Now she is a professional tennis player.

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    A woman's home is her castle. She cleans, cooks, decorates, repairs, works, plays and relaxes within the walls of her home. Sometimes women choose to stay at home to raise their children instead of working outside of the home. So you think she must be bored. I was one of those women.

    After finally getting pregnant, and giving birth, I found my home to be the best place. During the nine months I carried my daughter, my body had been broken and back. Being able to relax was just what my weak body needed. Besides, nursing was a rest because I home certainly cured my broken body.

     other families grow one child after the next was a horrible dream, when I didn't think I would ever be able to have my own child. But after having Alyssa, my own cute little baby girl, I was e to let my heart recover from the wounds. I watched and I valued every small change of her body and personality. Nothing was more exciting than time spent with my child. I loved to stay at home.

    Mentally I remained challenged with new opportunities every day. I learned to be perfect and organized. Everything worked like a clock. By 9:00 in the morning, the house was clean--beds made, bathrooms cleaned, house cleaned, and windows cleaned. I enjoyed finishing them quickly so that I could devote most of the day to my daughter. Between nursing, short breaks and staring at her, I thought of ways to improve my home and myself. Even with all the housework, every day was filled with so much fun!

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