
A long time ago, there was a very big tree. A little boy loved to come and play around it 1 He loved the tree and the tree loved to play with him. Time went by. The little boy had grown up and he no longer (不在) played around the tree. One day, the boy came back and the tree was so2"Come and play with me!" the tree said." I don't have time 3. I have to work for my family. We need a house. Can you help me?" "Sorry, I don't have a house. 4you can cut off my branches (树枝) to build your house." So the boy cut all the branches of the tree and left 5
The tree was glad to see him happy, but the boy didn't come after that.
The tree was lonely and sad. One hot summer day, the boy came back and the tree was happy." Come and play6me!" the tree said." I am sad and getting old. I want to go sailing (航行) to relax7. Can you give me a 8?"" Use my trunk (树干) to build the boat. You can sail and be happy." So the boy9the tree trunk to make a boat. He went sailing and did not show up for a long time.10, the boy came back after he left for so many years." Sorry, my boy, but I don't have anything for you. The only thing left is my dying roots." The tree said with tears." I don't need much now, just a 11to rest. I am tired after all these years."
The boy answered." Good! Old tree roots are the 12place to rest. Come here, please sit down with me and have a rest." The boy sat down and the tree was glad and smiled with tears.
This is a story of everyone. The tree is our 13
When we were young, we loved to play with Mom and Dad. When we 14, we leave them, and only come to them when we need something or when we are in trouble. No matter what, parents will always be there and give everything they have to make us happy. You may think that the boy isn't nice to the tree but that's 15all of us are doing to our parents.
石狮子见了我笑出了泪啊
小燕子见了我笑斜了翅膀啊
请回答:
(
)的离心率为
,过右焦点且垂直于长轴的直线与椭圆C交于P,Q两点,且
.
,
的斜率之积为
(以O为坐标原点),M是
的中点,连接
并延长交椭圆C于点N,求
的值.