阅读下面的文言文，回答后面小题。
     【甲】由是先主遂诣亮，凡三往，乃见。因屏人曰：“汉 室 倾 颓 奸 臣 窃 命 主上 蒙 尘 孤 不 度 德 量 力 欲 信 大 义 于 天 下 而 智 术 浅 短 遂 用 猖 蹶至 于 今 日 然 志 犹 未 已 君 谓 计 将 安 出?”
       亮答曰：“自董卓已来，豪杰并起，跨州连郡者不可胜数。曹操比于袁绍，则名微而众寡，然操遂能克绍，以弱为强者，非惟天时，抑亦人谋也。今操已拥百万之众，挟天子而令诸侯，此诚不可与争锋。孙权据有江东，已历三世，国险而民附，贤能为之用，此可以为援而不可图也。荆州北据汉、沔，利尽南海，东连吴会，西通巴、蜀，此用武之国，而其主不能守，此殆天所以资将军，将军岂有意乎？益州险塞，沃野千里，天府之土，高祖因之以成帝业。刘璋暗弱，张鲁在北，民殷国富而不知存恤，智能之士思得明君。将军既帝室之胄，信义著于四海，总揽英雄，思贤如渴，若跨有荆、益，保其岩阻，西和诸戎，南抚夷越，外结好孙权，内修政理；天下有变，则命一上将将荆州之军以向宛、洛，将军身率益州之众出于秦川，百姓孰敢不箪食壶浆以迎将军者乎？诚如是，则霸业可成，汉室可兴矣。”

                                                                                                                               （选自《隆中对》）
      【乙】亲贤臣，远小人，此先汉所以兴隆也；亲小人，远贤臣，此后汉所以倾颓也。先帝在时，每与臣论此事，未尝不叹息痛恨于桓、灵也！侍中、尚书、长史、参军，此悉贞亮死节之臣也，愿陛下亲之、信之，则汉室之隆，可计日而待也。
       臣本布衣，躬耕南阳，苟全性命于乱世，不求闻达于诸侯。先帝不以臣卑鄙，猥自枉屈，三顾臣于草庐之中，咨臣以当世之事，由是感激，遂许先帝以驱驰。后值倾覆，受任于败军之际，奉命于危难之间，尔来二十有一年矣。
       先帝知臣谨慎，故临崩寄臣以大事也。受命以来，夙夜忧虑，恐付托不效，以伤先帝之明；故五月渡泸，深入不毛。今南方已定，甲兵已足，当奖帅三军，北定中原，庶竭驽钝，攘除奸凶，兴复汉室，还于旧都。此臣所以报先帝而忠陛下之职分也。至于斟酌损益，进尽忠言，则攸之、依、允等之任也。

                                                                                                                              （选自《出师表》）

一个生态系统无论大小都是由（  ）

在做“研究匀变速直线运动”实验中，打点计时器打出的一条纸带中的某段如图所示，若A、B、C、D、E各点间的时间间隔均为0.10s，从图中给定的长度，求出小车的加速度大小是____，打下C点时小车的速度大小是____．（结果均保留3位有效数字）

阅读理解

    One fine afternoon I was walking along Fifth Avenue when I remembered that it was necessary to buy a pair of socks. I turned into the first sock shop that caught my eye, and a boy clerk who could not have been more than 17 years old came forward.

    “What can I do for you, sir?”

    “I wish to buy a pair of socks.”

    His eyes glowed. “Did you know that you had come into the best place in the world to buy socks?” I had not been aware of that.

    “Come with me,” said the boy happily. He began to haul (用力拖) down from the shelves box after box.

    “Hold on, boy, I am going to buy only one pair!”

    “I know that,” said he, “but I want you to see how beautiful these are. Aren't they wonderful?” There was on his face an expression of joy, as if he were showing to me the mysteries of his religion.

    “My friend,” said I, “if this is not just the enthusiasm (热情) that comes from novelty (新鲜), if you can keep up this day after day, in ten years you will own every sock in the United States.”

    In many shops the customer has to wait for someone to serve him. And when finally some clerk does notice you, you are made to feel as if you were disturbing him. He displays no interest either in you or in the goods he is paid to sell.

    Yet possibly that very clerk who is now so cold began his career with enthusiasm. As time goes by, the enthusiasm is gradually gone; his only pleasures were found outside of working hours. He became a mechanical (机械的), not inspired, salesman.

    I have observed such change in the lives of so many people in so many occupations that I have come to the conclusion that the fastest road to failure is to do things mechanically.