穿越时空，发挥想象力，假如你出身于长江下游某个地区的农民家庭，进京（长安）去参加科举考试，住旅店时结识了一位朋友，这位朋友对农村的生活很好奇，请你以唐朝人的身份向他介绍你们一天的生活。最好包括你们种植什么，使用什么工具、吃什么、穿什么、用什么。

     This course is for those who want to learn to type, as well as those who want to improve their typing. The course is not common. You are tested in the first class, and begin practising at one of eight different skill levels. This allows you to learn at your own speed. Each program lasts 20 hours. Bring your own paper.
Course fee: $125      Materials:  $25
     Two hours for each evening for two weeks. New classes begin every two weeks.
This course is taught by a number of professional business education teachers who have successfully taught typing course before.
UNDERSTANDING COMPUTERS
This twelve-hour course is for people who do not know very much about computers, but who need to learn about them. You will learn what computers are, what they can or can't do and how to use them.
Course fee：$75  Jan 4,7,11,14,18  Wed.&Sat. 9:00---11:30 a.m.  Equipment fee:$10
David is a professor of Computer Science at Beijing University. He has over twenty years of experience in the computer field.  
STOP SMOKING
    Do you want to stop smoking? Have you ever tried and failed? Now is the time to stop smoking using the latest methods. You can stop smoking, and this twelve-course will help you do it.
Course fee：$30  Jan 2,9,16,23   Mon 2:00---5:00 p.m.
Dr. John is a practicing psychologist who has helped hundreds of people stop smoking.

有含盐率16%的盐水40千克，要使其含盐率提高到20%，需要蒸发____ 千克水；又或者加入____ 千克的食盐．

阅读下面的文言文，完成小题。

    余阙，字廷心，世家河西武威。少丧父，授徒以养母，与吴澄弟子张恒游，文学日进。元统元年，赐进士及第，授同知泗州事，为政严明，宿吏皆惮之。俄召入，应奉翰林文字。以不阿权贵，弃官归。寻以修辽、金、宋三史召，复入翰林，为修撰。出为湖广行省左右司郎中。会莫徭蛮反，右丞沙班当帅师，坚不往，无敢让之者。阙曰：“右丞当往，受天子命为重臣，不思执弓矢讨贼，乃欲自逸邪！”沙班曰：“郎中语固是，如刍饷不足何？”阙曰：“右丞第往，此不难致也。”阙下令趣之，三日皆集，沙班行。至正十二年，改宣慰司为都元帅府，治淮西，起阙副使、佥都元帅府事，分兵守安庆。于时南北音问隔绝，兵食俱乏，抵官十日而寇至，拒却之。乃集有司与诸将议屯田战守计，环境筑堡寨，选精甲外捍，而耕稼于中。明年，春夏大饥，人相食，乃捐俸为粥以食之，得活者甚众。民失业者数万，咸安集之。升副元帅。十五年夏，大雨，江涨，屯田禾半没，城下水涌，有物吼声如雷，阙祠以少牢，水辄缩。秋稼登，得粮三万斛。俄升都元帅，守安庆。十月，贼薄城下。戊申，贼并军攻东西二门，西门势尤急，阙身当之，徒步提戈为士卒先。士卒号哭止之，挥戈愈力，斩首无算，而阙亦被十余创。日中城陷，城中火起，阙知不可为，引刀自刭，堕清水塘中。阙妻耶卜氏及子德生、女福童皆赴井死。城中民相率登城楼，自捐其梯曰：“宁俱死此，誓不从贼。”焚死者以千计。阙号令严信，与下同甘苦，然稍有违令，即斩以徇。当出战，矢石乱下如雨，士以盾蔽阙，阙却之曰：“汝辈亦有命，何蔽我为！”。稍暇即注《周易》帅诸生谒郡学会讲立军士门外以听使知尊君亲上之义有古良将风烈。卒时年五十六。

（节选自《元史·列传》，有删改）