人人都渴望幸福，人人都在感受幸福。幸福有时很抽象，有时又很具体；幸福有时很遥远，有时又近在咫尺。奉献是幸福，给予是幸福，获得是幸福，享受是幸福……一句祝福的话语是幸福，一个理解的眼神是幸福……幸福是心灵的感觉，幸福是生命的体验……

    请围绕“幸福”这个话题，写一篇800字左右的记叙文。

    要求：选好角度，明确立意，自拟标题，不要脱离材料内容及含意的范围作文，不要套作，不得抄袭。

若直角坐标平面内的两点P、Q满足条件：

①P、Q都在函数y=f（x）的图象上；

②P、Q关于原点对称，则称点对P，Q是函数y=f（x）的一对“友好点对”（点对P，Q与Q，P看作同一对“友好点对”），

已知函数f（x）=$\left\{\begin{array}{c}{\log }_{2}x\left(x>0\right)\\ -x^2-4x\left(x\le 0\right)\end{array}\right.$，则此函数的“友好点对”有（　　） 

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

    I hardly remember my grandmother. She used to holding me on her knees and sing old songs. I was only four when she passes away. She is just a distant memory for me now.

    I remember my grandfather very much. He was tall, with broad shoulder and a beard that turned from black toward gray over the years. He had a deep voice, which set himself apart from others in our small town, he was strong and powerful. In a fact, he even scared my classmates away during they came over to play or do homework with me. However, he was the gentlest man I have never known.