题干

平板电脑(iPad),它有WIFI无线上网、3G通信、蓝牙三种网络通信技术,这三种技术都是利用(  )

A:超声波

B:紫外线

C:可见光

D:电磁波

上一题 下一题 0.0难度 选择题 更新时间:2013-08-21 05:12:54

答案(点此获取答案解析)

D

同类题1

阅读理解

    What makes a gift special? Is it the price you see on the gift receipt? Or is it the look on the recipient's face when they receive it that determines the true value? What gift is worth the most?

    This Christmas I was debating what to give my father. My dad is a hard person to buy for because he never wants anything. I pulled out my phone to read a text message from my mom saying that we were leaving for Christmas shopping for him when I came across a message on my phone that I had locked. The message was from my father. My eyes fell on a photo of a flower taken in Wyoming, and underneath a poem by William Blake. The flower, a lone dandelion standing against the bright blue sky, inspired me. My dad had been reciting those words to me since I was a kid. That may even be the reason why I love writing. I decided that those words would be my gift to my father.

    I called back. I told my mom to go without me and that I already created my gift. I sent the photo of the cream-colored flower to my computer and typed the poem on top of it. As I was arranging the details another poem came to mind. The poem was written by Edgar Allan Poe; my dad recited it as much as he did the other. I typed that out as well and searched online for a background to the words of it. The poem was focused around dreaming, and after searching I found the perfect picture. The image was painted with blues and greens and purples, twisting together to create the theme and wonder of a dream. As I watched both poems passing through the printer, the white paper coloring with words that shaped my childhood, I felt that this was a gift that my father would truly appreciate.

    Christmas soon arrived. The minute I saw the look on my dad's face as he unwrapped those swirling black letters carefully placed in a cheap frame, I knew I had given the perfect gift.

同类题2

现代文阅读

北京滋味

       ①我是到28岁时才开始“读”北京的,因为那年我上了北大,第一次听侯仁之教授的课,此前我已在北京生活21年,听了侯教授讲座我才知道,前21年基本白活。因为北京太有意思,而我,却只是在北京“活着”而已。次日,我流连于北大勺园,想米万钟,又想到侯教授的老师洪煨莲。到了星期日,我跑到永定河畔,感受这几近枯竭的河水当年如何孕育出一个聚居点,成为了都市最原始的胚胎。我又跑到莲花池,因为记得侯教授说过,莲花池之水滋养了蓟城,由此而兴建起金朝的中都,北京城即由此发展起来。坦率地说,只凭一次历史地理学讲座听来的知识,我哪里看得出什么名堂?北京是需要读的,可以用历史地理学的眼光去读,还可以用民俗学、政治学、建筑学、方言学、艺术史、文学史……北京有着品不尽的滋味。

       ②北京滋味在庙堂之高,也在胡同之深;在官宦之显,___________________;在历史的积淀,也在当下的开拓。缤纷斑谰,深邃无涯。因此,读北京,说读懂了,已不够谦虚,说读透了,那肯定是吹牛。寻访历史,你会发现这是一个不时发生惊心动魄的历史事件的地方——望着天安门巍峨的宫墙,我老是在想象当年那只颁诏的“金凤”,如何从城堞上放下来,把宣统退位的旨意昭告天下;走过张自忠路,我总是想起倒在段祺瑞执政府门前的刘和珍那样的烈士们;到一个宅子里吃饭,人家告诉我这是民国外交家顾维钧的住宅,顿时吓了一跳:这也是孙中山先生来京养病和最终辞世的铁狮子胡同行辕啊。这就是北京,历史的风云说不定啥时就在身边翻卷起来。

       ③北京是个藏龙卧虎,蕴含着丰沛的性格故事和人生感悟的地方。我曾经听过几位“八旗子弟”讲述自己家族的败落史,讲述他们怎样沦落到天桥唱起了单弦岔曲,为了维护一点贵族的尊严,坐着洋车去,坐上洋车回,在家里却又五脊六兽地期盼着书场的掌柜登门送钱。造就了北京人的戏剧性格的,与其说是帝王将相、达官显贵,不如说是如此跌宕起伏的人生。

       ④只有品味到了这深层的韵味,你才算接触到真正的北京滋味啦。什么时候你不说“明天”,而是说“明儿”了,什么时候你不说“硬朗”,而是说“硬硬朗朗”了——也就是说,你会用“儿化韵”和“双声叠韵”说话了,你算是到了北京了。

       ⑤当然,也就是“到了”而已。当你夸奖某个北京人,却听他一本正经地说:“您这是骂我!”你毫不吃惊,反而哈哈大笑,您算是开始学会品咂北京滋味,读懂北京人了。

       ⑥读懂北京人不是一件容易的事。十几年前,王朔和他的几个哥们儿拍了一个电视情景剧,即将播出时有个发布会,记者问:“您认为这出戏拍得怎样?”王朔说,顶不济也是一本《飘》吧,闹不好还整出本《红楼梦》呢!媒体当即大哗——朔爷敢放如此狂言,真是滑天下之大稽也!其实,滑天下大稽者不是王朔,而是诸公啊。首先阁下问题就问得笨,电视剧的发布会,本来就是想告诉你本片拍得棒,你还要问人家拍得怎样。其次是王朔回答得妙——北京智慧啊,给你幽默一下,夸饰一下,其实这夸饰里充满了自嘲,潜台词是:您还指望我能给您写本《红楼梦》怎的……要是非得看了我这文章您才明白王朔,您还需要再学。

       ⑦等到终于有那么一天清晨,您在街上看到了几个老爷子。他们在三轮车上放着几只鸟笼子,上面蒙着蓝色的罩子。老人们说,得赶在汽车喧嚣之前把他们的百灵送进景山或者天坛。你说:“唉,给鸟儿都那么上心,不易啊,可话又说回来,天棚鱼缸石榴树的北京啊,没啦……”有这话,您就差不多及格了。因为您学会了北京人的思考,会“话又说回来”啦。

(有删改)

      [注解]⑴米万钟(1570—1628),明朝著名学者、书法家、画家,前燕京大学(今北京大学所在地)图书馆编印的《勺园图考录》中有米万钟画的《勺园修图》。⑵洪煨莲(1893—1980),知名学者,曾出任燕京大学文理科科长(又称教务长)。⑶“金凤颁诏”是明清时期,皇帝登基、册立皇后等重大庆典时在天安门举行的颁诏仪式。天安门最后一次举行“颁诏”是清宣统三年(1911年)十二月二十五日隆裕太后颁布溥仪退位的诏书。⑷行辕,主要指军事统帅在某一区域所开设的,有高级将官代理办公的官署。