阅读短文，回答下面问题。

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     周恩来同志顽强的学习精神和旺盛的求知欲望，来自他的伟大抱负。

     早在青少年读书时期，他就确立了为着中华民族的富强，为着造福于人民而学习的志向。

     1910年，12岁的周恩来随同伯父到东北读书。在这期间，他阅读了不少热心改革的中外政治思想家的著作，幼小的心灵燃起了改造中国、富强中华民族的火焰。

     有一天，身穿长衫的魏校长给学生上课时，问大家：“同学们，你们为什么而读书啊？”

     教室的气氛顿时紧张起来。

     老校长叫起一个出身书香门第的学生，让他回答这个问题，他慢声慢语地说：“为明礼而读书。”

     老校长摇了摇头，又叫一个官家子弟。这个学生很傲慢地回答：“为做官而读书。”

     老校长叹了口气，接着把一个靴鞋老板的儿子叫了起来。他得意洋洋地答道：“为家父而读书。”

     其他一些家境贫穷的学生，有的说；“为挣钱，为吃穿!”也有的说：“为不欺负!”

     老校长皱着眉头，在教室里踱来踱去，眼光忽然落在周恩来的身上：“周恩来，你为什么到学校来读书?”

     周恩来从容不迫地站起来，用南方口音清晰有力地答道：“我为中华之崛起而读书!”

     这异于寻常的回答，使魏校长十分震惊。他没料到一个年位十二三岁的孩子，竟有如此远大的抱负!校长睁大吃惊的眼睛又追问：“你为什么读书?”周恩来提高嗓音，坚定地重复着：“为中华之崛起而读书!”

     这铿锵有力的声音，在小小的教室里久久回响。老校长高兴地说：“______”

C

    How often do you check your phone? According to a study led by Nottingham Trent University in Britain, the average person looks at their phones 86 times a day. Updating their status on social media platforms also made people reach for their electronic companion frequently.

    Even the participants thought that was a lot: this figure is twice as often as they thought they did. Our phones might be shaping our behavior more than we realize. Do you actually look at your surroundings more than at your phone? Is it rude to check your phone when someone is talking to you?

    Sherry Turkle interviewed hundreds of college students about this. She's a professor of social studies at the Massachusetts Institute of Technology. They talked about something they called "the rule of three".

    The rule has to do with being considerate to others despite the allure (诱惑力) of the little flat box. Turkle explains: "If you go to dinner with friends, you don't want to look down at your phone until you see that three people are looking up in the conversation. So there's a new rule where you don't look down unless three people are looking up in order to keep a little conversation alive."

    Actually, if you are clever enough you might use your phone as a tool to connect with people next to you. Sharing a bit of your life with them can bring you closer together. And you can also invite everyone to take a selfie (自拍照) with you.

    But the best thing to deal with mobile phone addiction is to go cold turkey and leave the machine behind occasionally or just switch it off and keep it firmly in your pocket for a while.

注：O₂相对变化量，+ 表示增加，— 表示减少，