阅读张保振的《交友之道》，回答问题

交友之道

    ①俗话说：“在家靠父母，出门靠朋友”，说明朋友的重要。《诗•小雅》言：“虽有兄弟，不如友生”，说明朋友的至要。《孟子•滕文公上》载：“出入相友”，说明朋友的必要。朋友的重要、至要、必要，在古人看来，是“友也者，友其德也”的。所以，与朋友交，就要只取其长，不计其短。也就是说，交友要有选择，看重并学习朋友的优良品德。

    ②那么在现代生活中，我们又该怎样交友呢？

    ③交友之道首先是择友。不是什么人都可以成为朋友的。对朋友，古人们看得很重，认为是“五伦之一”，是“平居可与共道德，缓急可与共患难。”并认为，“友则两相关切。若酒肉饮博，相与往还，此党也，非友也。”（蒲松龄语）所以，择友，就要或道同相助，或品德相亲，或学问相成，或气节相感，或然诺相信，或才技相合，或诗文相尚等，要两相共赢，昭昭可鉴。毕竟，择友只有志趣相投，互为“人镜”，补充提高，才能获取增加一倍的智慧，放大一倍的力量，才能如同读一本圣贤经传，或一篇名人诗篇，使身心得到滋补，境界得以升华。而这，是从一般人那里难以得到的。

    ④交友之道关键是取友。世间尽管有“一见如旧识，一言知道心”的交友取友之道，但取友毕竟是取优，故不可等闲视之、草率取之。自古至今，为人称颂的取友之道，“慢热型”的居多。这种慢热型，往往是先淡后浓，先疏后亲，先远后近。初次见面，就亲热得不得了，未必是真友、至友，很可能是遇上了“见面熟”。这种“见面熟”式的朋友，当你遇到挫折，甚至将要掉进深渊时，他的双手未必来拉住你；当你一帆风顺，             。取友，就是要智可以砥砺，行可以辅弼，有了错误可以指正。司马迁在《史记•汲郑列传》中说：“一死一生，乃知交情。一贫一富，乃知交态；一贵一贱，交情乃见。”这“六个一”，全在人生的关节点，道出了取友的最佳点。所以，对贫贱之交、生死之交，不仅终生不可忘，而且要始终一契之。

    ⑤交友之道重点是结友。结友要结真友。无疑，在生活中，友有面友、真友之分。面友者，友而不心也。真友者，生无请言，死无托辞也。交友就要交真友。真友是需要风浪的考验、时间的检验的。人的一生不可能年年顺意，事事行时。在遇到人生的逆境、背时，才能对面友或真友看得清，分得明。这方面的教训很多。如战国中期有一对同习兵法、一师之徒的同窗朋友孙膑与庞涓，由于孙膑的才能略高一点而招致庞涓嫉恨在心，以至利用自己先到魏国并深得魏王重用的机会，密招孙膑入魏，口言善，说是要向魏王力荐；身行恶，实则借刀杀人，对孙膑施以膑刑①，“断其两足而黥之”，使孙膑成为一个“刑余之人”而不能进入仕途。这就警示人们，饮酒要饮醇，结交要结真。否则，不仅自己会吃尽苦头，而且连残至死都不知啥个原因。

    ⑥交友要交优。只有多看朋友的长处，把朋友的长处吸收为自己的长处，从而让朋友的优点、优势也能体现在自己身上，才能在人生路上肩并肩手挽手，共谱新篇章。

【注】①膑刑：古代剔除膝盖骨的酷刑。

    The Fitting-in of Suzy Khan

    The first time I saw Suzy Khan, I knew I had to help her. She was really small for her age of 12. The boy in my class often1about her and laughed their heads off. She would open a book, pretending to read, with tears dropping on the open page.

    All I knew was that she was an orphan(孤儿) from Africa. She had just been adopted by a family in town who2that the best way for her to learn American ways of life was to be with American kids. I looked down at this 3girl and promised myself that somehow I would help her.

    But how could I help her4in with us? There had to be a5

    One day, when I went into the classroom, I saw that Suzy had6her geography book to a picture of a train, and in her notebook, she had made a(n)7copy.

    I was surprised and thought that she could do something in the coming 8show. So, I took her to see the art teacher, Miss Parker, and showed her what Suzy had 9"Why, it's wonderful," said Miss Parker, who then showed us a poster she had painted10the talent show. "I need more of these, but I just don't have enough11Could you help me, Suzy?"

    On the day of the talent show, Suzy's12were everywhere—all over the hall and all over the school, each one different.

    "And finally," said Mr. Brown, the schoolmaster, at the end of the show, "we have a(n)13award. I'm sure you've all noticed the wonderful posters." Everyone nodded. "One of our own students14them."

    I could hear everyone whispering. "Who in our school could draw15well?"

    Mr. Brown waited a while before saying, "16this student worked so hard on the posters, she deserves a17 too. Our mystery(神秘) artist is our new student—Suzy Khan!"

    Mr. Brown thanked her for all the wonderful posters and gave her a professional artist's set. "Thank you," she cried.

    I18 at that time when I was looking at her excited face, she'd probably never19anything in her whole life.

    Everyone started to20their hands. Suzy Khan gave them a shy smile and the applause was deafening. I knew then Suzy was going to be all right.

用数学归纳法证明不等式1+ $\frac{1}{2^3}$ + $\frac{1}{3^3}$ +…+ $\frac{1}{n^3}$ ＜2﹣ $\frac{1}{n}$ （n≥2，n∈N₊）时，第一步应验证不等式（  ）