Many people traveled to Las Vegas, Nevada last week for the 50th Consumer Electronics Show, or CES. The show is said to have the largest collection of new electronic devices in the world.

    The show had many examples of “smart home” devices. “Smart home” technology is designed to make life easier for people by letting computers control many things inside our homes. One such device actually begins working outside the home, when someone arrives and rings the doorbell.

    “When someone comes to your front door and rings the doorbell, the light can turn on immediately. I get a notification when I'm halfway around the world that someone came, and I can start talking to the person who's at my front door, and I can say, 'Oh, here let me let you in,' I can unlock the door for them very easily.” Said Vivint, a smart home service provider.

    One electronics maker launched a device that lets people see and interact with their animals when they are away. The device, from Petcube, lets you remotely watch and talk to your pet through a personal device, according to a company official. It can even give the pet a treat—if you approve and order it.

    For heating or cooling, there is a smart thermostat. This device can also send you a message if a big storm causes leaks of flooding. “We're trying to catch it with just a few drips before it becomes a real big problem,” said Mike Sale of iDevices.

    A concern for many homeowners is the possibility that someone else might find a way to attack these smart home devices. An official from Vivint said his company is sure that only owners of the home can gain use of information on the devices. Warren Katz from iDevices said his company employs engineers from the defense industry to help prevent hacking.

在4Al+3O₂2Al₂O₃的化学反应中，____ 份质量的铝与____ 份质量的氧气恰好完全反应生成____ 份质量的氧化铝．

跑过冬天

——写在女儿成人之际

牧牧：

    ①还记得你5岁那年的冬天吗？每天早晨，爸爸总是带着你到离家不远的公园里跑步。

    ②最初，你跑一两圈就累了，停下来，央求着爸爸，不要让你跑了。但是，爸爸说不行，你必须跑完。你要跑累了呀，可以慢慢跑，要是慢慢跑还累呢，可以走着，但就是不能停下来。

    ③冬日清晨，公园里寂静无人。路边的杨树早已剥落成秃枝，在寒冷的空气中抖动。你努力地跑着，呼出的气化成一股股白雾。渐渐地，你跑热了，脱去的黄色毛线帽在手中随着你的运动在花坛周围画出一圈流线。于是，冬天不再寒冷，冬天有了生命的流动。

    ④如今，你要成为一个成年人了，即将接受成年洗礼。

    ⑤你会在某个夜晚，从大地仰望天空，一颗流星划过，转瞬即逝，留下一道亮光。我说，那就是人生。在时间的长河中，一生就只是那么短短的一瞬。

    ⑥当你生命开始的时候，你与所有的人没有什么不一样。可当你进入社会的时候，你与所有的人都不同。

    ⑦或许，你会遇到疾病，这是生命中最大的不幸之一。但是不论遇到什么样的疾病，都不要放弃与它的抗争，哪怕只有三天的光明。生死不能抵御，但生活可以选择。不要拿健康做人生的抵押，一生要锻炼身体，拥有健康的身体和心理。

    ⑧或许，你会陷入贫穷。贫穷并不可怕，可怕的是贫穷的精神。节俭是永恒的美德。如果富有，要帮助穷人。

    ⑨或许，你会遭遇失败，须知人生历程，逆境多，顺境少。故凡事要运用智慧，竭尽全力。社会只看你的结果，而你要看重努力的过程，即使失败，切勿自弃，社会不同情眼泪。上帝只救自救之人。

    ⑩或许你会落入孤独。坚定的攀登者总是孤独地前行，在情感的孤独中要守住自我，珍爱自己，五湖明月在，渔歌总有时。

    ⑪相貌与生俱来，一个人的美丽不是给所有人看的，也不会是所有的人都看着你美丽。支撑美丽的是品德、气质、文化。

    ⑫衣着要整洁协调。如果有钱，可以穿得好一些，但不要华贵；如果有时间，可以穿得美一些，但不要繁复。

    ⑬因为有了生命，时间才有了意义；因为有了时间，生命才有了延续。珍惜时间，珍惜生命，充分地使用你所拥有的每一天的时间和金钱。

    ⑭尽一切人生之责！

    ⑮所有的这一切，都是上帝给予你的人生苦难和责任，这就像江河行地，日月经天那样正常自然。既然如此，就让它来吧，你已经开始成人，用微笑和勇气拥抱你的人生！

    ⑯人生会有许多冬天，跑起来吧，不要停下，跑过冬天！

父亲