今日中国，“到此一游”触动的深刻反思，“扶起老人”引发的热烈讨论，无不折射国人对道德良知的珍视、对高尚品格的向往。形成健康的社会风尚，需要每个公民的协力；打造奋发的时代气质，离不开亿万人民的参与。这告诉我们应（    ）

①加强思想道德建设以提高全民族的科学文化素质       ②积极培育和践行社会主义核心价值观

③营造“我为人人，人人为我”的良好社会氛围          ④大力弘扬中华民族的传统美德

明朝中期以后，私营手工业在纺织、矿冶等行业逐渐占据主导地位，这一变化直接导致了

一条悬链长5.6m，从悬点处断开，使其自由下落，不计空气阻．则整条悬链通过悬点正下方12.8m处的一点所需的时间是（g=10m/s²）（   ）

    Twenty years ago, I drove a taxi for a living. One night I went to pick up a passenger at 2:30 AM. When I arrived there, I walked to the door and knocked, “Just a minute,” answered a weak, elderly voice.
    After a long pause, the door opened. A small woman in her eighties stood before me. By her side was a small suitcase. When we got into the taxi, she gave me an address, and then asked, “Could you drive through downtown?”
    “It's not the shortest way,” I answered quickly.
    “Oh, I'm in no hurry,” she said. “I'm on my way to a hospice(临终医院). I don't have any family left. The doctor says I don't have very long.”
I quietly reached over and shut off the meter(计价器).
     For the next two hours, we drove through the city. She showed me the building where she had once worked, the neighborhood where she had lived, and the furniture shop that had once been a ballroom where she had gone dancing as a girl.
    Sometimes she'd ask me to slow down in front of a special building and would sit staring into the darkness, saying nothing. In the early morning, she suddenly said,” I'm tired. Let's go now.”
    We drove in silence to the address she had given me.
    “How much do I pay you?” she asked.
    “Nothing.” I said.
    “You have to make a living,” she answered. “Oh, there are other passengers,”I answered.
     Almost without thinking, I gave her a hug(拥抱). She held on me and said, “You gave an old woman a little moment of joy.”

下面的通知在格式和内容方面存在四处错误，请改正。

通知

       我校定于本周五下午举行七年级学生“趣味语文知识”竞赛，希望七年级每班选派五名代表按时参加。

此致

敬礼

七年级语文组