阅读下面的短文，然后按照要求写一篇150左右的英语短文。
Insistence or Giving up
There is a battle in our daily life. Two forces are fighting with each other again and again. They never stop until you are buried in the earth. We called them insistence and giving up. They are like twins. One is angle, and the other is a demon..
As we all know, we want to pass the CET-4. So we get our own strategy. First of all, I am bound to master five thousand vocabularies. Second, I will write an article every week which is at least two hundred words. Then I will read at least two English articles, make more friends with foreigners for learning native English, and listening to some English news broadcast every day.
Nevertheless, according to my strategy, the first day, I should wake up at 6 a.m. to memorize at least twenty words. The alarm clock rings for me; I should get rid of my bed in order to study. Suddenly, “Giving up” came and whispered to me. “What about a five-minute prolong sleeping? How soft, comfortable this bed is! But Ms Insistence urged me, “Don’t listen to him; Come on, let’s carry out our plan.” Her voice is sweet, but not what I need.
Time flies! If we can’t seize every opportunity to appreciate time, Mr. Giving up will win all the time. Insistence of your plan, your dream may not be accomplished successfully, but giving up, you are sure to fail in life. (237w)
【写作内容】
有些人做事有时候缺乏持之以恒的毅力。请就“坚持” 还是 “放弃”的话题发表你自己的看法，内容要点包括：
1 以约30个词概括阅读材料的要点；
2 请选择一个角度，用你自己或朋友的经历，以约120个词谈谈自己的观点，内容包括：
1）持之以恒对工作和学习有什么意义；
2）以成功或失败的事例来说明持之以恒的重要性；
3）你对大家的建议是什么。
【写作要求】
在作文中可以使用自己的亲身经历或虚构的故事，也可以参照阅读材料的内容但不得直接引用原文中的句子；作文中不能出现真实姓名和学校名称。
对任意实数
满足：
，且
，则下列结论正确的是 ．
对称；④
对称． 