I was only nine years old when I learnt how to use a computer．My mother is my first teacher．I know how to type，how to copy a file，and how to visit a website on the Internet．One day，mom was not at home．I turned on the computer and began to learn how to chat on net．The first one I met there was a boy called Tom．He greeted me politely．When he knew that I was only a 9-year-old girl and almost knew nothing about chatting on net，he started showing me how to use the chatting tools，how to download，and how to send e-mails．I learnt a lot from him．

获2014“最美乡村教师”、2014“感动中国”年度人物称号的朱敏才、孙丽娜夫妇,9年前,当他们得知贵州山区严重缺乏师资时便决定去义务支教。他们给孩子买来字典,帮助孩子养成良好的卫生习惯。夫妇俩通过上课、游戏和多种课外活动让孩子们逐渐开朗、自信。9年来,两位老人的足迹遍布贵州七八所乡村小学。虽然山村的艰苦条件让他们落下一身疾病,但他们说:“能发挥余热,是我们最大的满足。孩子的变化是我们最大的动力。只要还能爬起来,就会待下去。”

“冷战”与“铁幕”一词同时流行，表明美苏之间除了直接战争外，在经济、政治、军事、外交、文化、意识形态等方面都处于对抗状态。下列关于美苏之间冷战的表述，不正确的是