阅读下面的文字，完成下列小题。

你与谁聊天

白旭初

    老头子走了。女儿也走了。

    天国没有回程的路，老头子永远回不来了。女儿在南方的台资企业打工，一年才能回来一次。

    女儿回南方前对老妈说，老爸的手机您用着吧，有事打我的电话，我也会常打电话给您。

    老妈本地再无亲人，加上腿脚不太灵便，每天除了到附近菜市场买菜，自个儿做饭自个儿吃外，就是靠在沙发上，盯着茶几上的手机发呆。她期待和南方的女儿说说话，但手机沉默着一声不响。

    这天，老妈毅然拿起手机，拨了女儿的号码，但传来的是另一个女人的声音：您拨的号码已关机。

    老妈又连续拨了几次，还是关机。她生气地把手机扔在沙发上。

    傍晚时分，老妈的手机突然响起来，接着传来女儿焦急的声音：老妈，您打我5个电话，家里有急事？您还好吗？

    家里没事，我也没事，就是想和你说说话儿。老妈说，你怎么把手机关了呢？……我在流水线上干活，一刻也不能停手。女儿说，而且，上班时间接打电话要罚钱的。

    老妈说，你这么晚了才下班？

    嗯，天天加班。女儿打了个哈欠，说，下了班就想睡。

    老妈泪眼朦胧，说，下班了抓紧时间休息，不给我打电话不要紧，打长途挺费钱的！

    女儿想，老妈真可怜，今后再忙再累也不能忘了给她打打电话。

    一天，女儿轮休，她上街买日用品时给老妈打了个电话，语音提示却说：您拨打的用户正在通话中。女儿想，好事呀，老妈终于和别人有往来有联系了。

    女儿买完东西后，又给老妈打电话，语音提示还是说：您拨打的用户正在通话中。女儿想，这电话打得够久的了，老妈和谁通话呢？ 

    女儿不记得重拨了几次，老妈的手机终于接通了。女儿问，老妈，和谁打电话呀？打了这么长时间！

    老妈说，一个熟人。

    女儿说，聊些什么呢？

    老妈顿了一下，说，没聊什么，就是天南地北聊天呗！

    女儿和老妈聊了20多分钟。挂了电话后，还沉思了一会儿。

    又一天，女儿上班时，流水线突然出故障停机了。趁流水线抢修间隙，工人们都走到车间外透气。女儿忙开了手机给老妈打电话，奇怪的是，语音提示又说：您拨打的用户正在通话中。女儿隔一会儿重拨一次，直到流水线修好了，老妈的手机也没能接通。

    晚上，女儿又给老妈打电话。电话通了，母亲却说，有事吗？没事别打电话，费钱呢！

    女儿说，老妈您开电话会议呀，和谁聊天呢？

    老妈说，也是熟人。

    女儿说，聊些什么呢？

    老妈说，没聊什么，就是天南地北聊天呗！

    女儿想，老妈是不是有了相好的？女儿说，和你聊天是个老头儿吧？

    老妈不语，只嘿嘿一笑。

    女儿暗思忖：老妈还不到花甲年纪，有个老来伴也是一桩美事啊！

    女儿请了几天假，决定回家一探究竟。女儿刚进家门，老妈的手机就响起来。

    老妈把手机举到耳边，问，你好！你是谁？你找谁？

    老妈说，哦，你要我猜你是谁？哦，我猜不出。

    老妈说，你要我仔细听你的声音，我也听不出你是谁。

    老妈说，哦，你是湖北的，我猜出来了。你姓董吧？

    老妈说，怎么样？我猜对了吧！我还知道你是我老头子的亲侄子呢

    老妈说，哎呀！伯伯得癌症住了医院？借两万块钱，没问题。

    老妈说，别急！叔叔到上海出差，等几天才能回来，到时会把钱送到医院去。

    老妈说，啊，不要叔叔送？好，他回来后，就把钱给打过去……

    女儿再也听不下去，大声说，老妈，这是——

    女儿还没把“骗子”二字喊出口，老妈就急忙把通话结束键按了。

    老妈说，我早知道他们是骗子。当年你老爸就上过当。

    女儿说，知道是骗子干吗还聊得起劲？

    老妈说，一个个骗子打电话给我，我就当是聊天呗！

    老妈又说，只要不把话说死，不揭穿他们的鬼把戏，他们就会天天打电话来。

    女儿眼里顿时汪满了泪水。

    A lady in an old cotton dress and her husband, dressed in an old suit, stepped off the train in Boston, and walked into the president of Harvard's outer office. The secretary could tell in a moment that such country people had no business at Harvard. She frowned(皱眉). “We want to see the president,” the man said softly. “He'll be busy all day,” the secretary said coldly. “We'll wait,” the lady replied.
    For hours, the secretary didn't talk to them, hoping that the couple would finally become tired and go away. They didn't. And the secretary finally decided to disturb the president. “Maybe if they just see you for a few minutes, they'll leave,” she told him. He frowned too. Someone of his importance obviously didn't have the time to spend with them.
    The president walked toward them unwillingly. The lady told him, “We had a son that attended Harvard for one year. He loved Harvard, and was very happy here. But he was accidentally killed. And my husband and I would like to set up a memorial(纪念碑) to him somewhere on campus. ”The president was so surprised that he shouted sharply, “We can't put up a statue(塑像) for every person who attended Harvard and died. This place would look like a cemetery (墓地).
   “Oh, no” the lady explained, “We don't want to build a statue. We thought we would give a building to Harvard.” The president rolled his eyes. He glanced at their plain clothes, and said with surprise, “A building! Do you have any idea how much a building costs? We have over seven and a half million dollars in the physical buildings here at Harvard.”
    For a moment the lady was silent. The president was pleased. He could get rid of them now. The lady turned to her husband and said quietly. “Is that all it costs to start a university? Why don't we just start our own?” Her husband nodded. Mr. and Mrs. Leland Stanford walked away, traveling to Palo Alto, California where they set up the university with their name, Stanford University, a memorial to a son that Harvard no longer cared about.

①小王通过瓜子二手车平台,低价购买了一辆二手汽车

②小李通过58同城网络平台,将家中闲置的房屋順利出租

③小周通过网络融资平台,享受了金融资本众筹

④小张通过聊天平台,将自己闲置的充电宝赠送给了网友

己知命题 “$\exists x\in R,$使$2x^2+(a-1)x+\frac{1}{2}\le 0$”是假命题，则实数a的取值范围是(  )