火星直径约为地球的一半，表面重力加速度约为地球的0.4倍，则火星质量约为地球的（   ）

小刚是一名善于学习的优秀初三学生，他经常把学过的化学知识自觉进行归纳整理，形成化学知识体系。有一天他复习化学时，发现自己总结的内容有误，请你帮他找出来（   ）

—Do you know who Mark Twain was ?

 —Of course .He was _______a famous American writer.

阅读理解Man or woman or a girl ?
One day, there is a man with long hair in the park. He is sitting on a chair, at this time an old man asks him, Is it a boy or a girl over there? She has long hair. I think she is a girl. Can you tell me?”
    “Yes. You are right. She is my daughter.”
    “Oh, I know. You must be the girl's mother.”
    “No， I'm her father.”The man is very angry（生气）.

设函数f（x）为R上的奇函数，已知当x＞0时，f（x）=﹣（x+1）²．

（Ⅰ）求函数f（x）的解析式；

（Ⅱ）若f（m²+2m）+f（m）＞0，求m的取值范围．