“功夫不负有心人”中的“功夫”指____“有心人”在课文中指____

如图，直线AB:y=一 $\frac{1}{2}$ x+2与x轴相交于点A，与y轴交于点B．直线CD：y=kx+b经过点c(一1，0)，D(0， $\frac{1}{3}$ )，与直线AB交于点E．

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

    One of the easiest things in the world is to become a fault-finder. However, life can be 1when you are not busy finding fault with it.

    Several years ago I2a letter from seventeen-year-old Kerry, who described herself as a world-class fault-finder, almost always3by things. People were always doing things that annoyed her, and 4was ever good enough. She was highly self-critical and also found fault with her friends. She became a really 5person.

    Unfortunately, it took a horrible accident to change her 6.Her best friend was seriously hurt in a car crash. What made it almost 7to deal with was that the day before the8, Kerry had visited her friend and had spent the whole time criticizing her9of boyfriends, the way she was living, the way she related to her mother, and various other things she felt she needed to 10It wasn't until her friend was badly hurt that Kerry became 11her habit of finding fault. Very quickly, she learned to appreciate life rather than to 12everything so harshly ( 刻薄) . She was able to transfer her new wisdom to other parts of her13as well.

    Perhaps most of us aren't as extreme at fault-finding, 14when we're honest, we can be sharply 15of the world. I'm not suggesting you16problems, or that you pretend things are17than they are, but simply that you learn to allow things to be as they are—18most of the time, and especially when it's not a really big19.

    Train yourself to "bite your tongue" , and with a little20 you'll get really good at letting things go. And when you do, you'll get back your enthusiasm and love for life.

阅读文言文，回答问题。
    李时勉，名懋，以字行，安福人。成童①时，冬寒，以衾裹足纳桶中，诵读不已。中永乐二年进士。选庶吉士，进学文渊阁，与修《太祖实录》。授刑部主事，复与重修《实录》。书成，改翰林侍读。
    性刚鲠，慨然以天下为己任。十九年，三殿灾，诏求直言。条上时务十五事。成祖决计都北京。而时勉言营建之非，忤帝意。岁余得释，杨荣荐复职。
    洪熙元年复上疏言事。仁宗怒甚，召至便殿，对不屈。命武士扑以金瓜，肋折者三，曳出几死。明日，改交阯道御史，命日虑一囚，言一事。章三上，乃下锦衣卫狱。时勉于锦衣千户某有恩，千户适莅狱，密召医，疗以海外血竭，得不死。仁宗大渐②，谓夏原吉曰：“时勉廷辱我。”言已，勃然怒，原吉慰解之。其夕，帝崩。
    宣帝即位已逾年，或言时勉得罪先帝状。帝震怒，命使者：“缚以来，朕亲鞫，必杀之。”已，又令王指挥即缚斩西市，毋入见。王指挥出端西旁门，而前使者已缚时勉从端东旁门入，不相值。帝遥见骂曰：“尔小臣敢触先帝!疏何语？趣言之。”时勉叩头曰：“臣言谅阴③中不宜近妃嫔，皇太子不宜远左右。”帝闻言，色稍霁。徐数至六事止。帝令尽陈之。对曰：“臣惶惧不能悉记。”帝意益解，曰：“是第难言耳，草安在?”对曰：“焚之矣。”帝乃太息，称时勉忠，立赦之，复官侍读。比王指挥诣狱还，则时勉已袭冠带立阶前矣。
    宣德五年修《成祖实录》成，迁侍读学士。帝幸史馆，撒金钱赐诸学士。皆俯取，时勉独正立。帝乃出余钱赐之。正统三年以《宣宗实录》成，进学士，掌院事兼经筵官。六年代贝泰为祭酒。八年乞致仕，不允。十二年春乃得请。朝臣及国子生饯都门外者几三千人，或远送至登舟，候舟发乃去。
    英宗北狩，时勉日夜悲恸。遣其孙骥诣阙上书，请选将练兵，亲君子，远小人，褒表忠节，迎还车驾。景泰元年得旨褒答，而时勉卒矣，年七十七，谥文毅。
（选自《明史》，有删节）
注①成童：十五岁以上。②大渐：病重。③谅阴：居丧。

如图所示是一个抛物线形桥拱的示意图，在所给出的平面直角坐标系中，当水位在AB位置时，水面宽度为10m，此时水面到桥拱的距离是4m，则抛物线的函数关系式为（　　）