题干

电视机遥控器是通过____来实现电视机控制;用高倍放大镜近距离观察正在播放节目的彩色电视机屏幕,会看到红、____、蓝三色光带。
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答案(点此获取答案解析)

红外线,绿

同类题2

阅读下面的文字,完成小题。

泥斑马

肖复兴

    家里大院的大门很敞亮,左右各有一个抱鼓石门墩,下有几级高台阶。黑漆大门上,有一副对联:“忠厚传家久,诗书继世长。”有点儿老一辈的气势。在老北京,这叫广亮式大门,平常的时候不打开,旁边有小门,人们从那里进出。台阶上有一个平台,平台显得很宽敞。王大爷的小摊就摆在那里,很是显眼,街上的人,一眼就能望见。

    王大爷的小摊,卖些糖块儿、洋画片和泥玩具之类的东西。泥玩具,多是些小动物,是王大爷自己捏的,涂上颜色,非常好看,活灵活现,卖得不贵,因此,很受小孩子欢迎。我常常一放学就到王大爷的小摊前,看一会儿,玩一会儿,王大爷望着我笑,任我随便摸他的玩具。

    我真佩服王大爷的手艺.他的手指很粗,怎么就能那么灵巧地捏出那么小的动物来?

    王大爷那时五十多岁,住在我家大院的东厢房。他人很随和,逢人就笑。那时,王大爷的东西很便宜,人们生活不富裕,因此他赚的钱也不多,只能勉强生活。

    王大爷老两口只有一个儿子,大院里的人都知道,儿子是抱来的。将近三十,还没结婚,在铁路上开火车,和王大爷两口挤在一间房里。让他头疼的是儿子以后找个媳妇,可怎么住呀?

    那一年寒假,我常到王大爷小摊前玩。有一天,他在做玩具,问我:“你说做一个什么好?”我随口说了句:“做只小马吧。”他点点头。没一会儿的工夫,就捏出了.只小马的样子。他抬起头又问我:“你说上什么颜色好?”我随口又说:“黑的!”“黑的?”王大爷反问我一句说:“一色儿黑,不好看,来个黑白相间的吧,好不好?”

    那时候,我没有细想,这个黑白相间的小马会是什么样子。等王大爷把颜色涂了一半,我才发现,原来是一只小斑马。黑白相间的弯弯条纹,让这只小斑马格外活泼漂亮。“王大爷,您的手艺真棒!”我情不自禁地说。

    第二天,小斑马的漆干了,脖子上系一条红绸子,绸子上挂着个小铜铃铛,风一吹,铃铛不住地响,小斑马像活了一样。

    我太喜欢那匹小斑马了。每次路过小摊都会站住脚,反复地看,好像它也在看我。那一阵子,我满脑子都是这个小斑马,可惜没有钱买。几次想张嘴跟家人要钱。接着又想,小斑马的脖子上系着个小铜铃铛,比起一般的泥玩具,钱稍微多了点儿,便把冒到嗓子眼儿的话,又咽了下去。

    春节一天天近了,小斑马不知哪一天就会被哪个孩子买走,带回家过年。一想起这事,我心里很难过,百爪挠心,好像小斑马是我的,会被别人抢去。在这样的心理驱使下,我干了一件“蠢事”。

    那一天,天快黑了,因为临近过年了,小摊前站着不少人,都是大人带着孩子来买玩具的。我趁着天暗,伸手一把就把小斑马“偷走”了。飞快地把小斑马揣进棉衣口袋里,小铃铛轻轻地响了一下,我的心在不停地跳,觉得那铃声,王大爷好像听见了。

    这件事很快被爸爸发现了,他让我把小斑马给王大爷送回去。跟在爸爸的后面,我头都不敢抬起来。王大爷爱怜地望着我,坚持要把小斑马送给我。爸爸坚决不答应,说这样会惯坏了孩子。最后,王大爷只好收回小斑马,还嘱咐爸爸:“千万别打孩子,过年打孩子,孩子一年都会不高兴的!”

    就在这一年,为了支援“三线建设”,政府动员人们去甘肃。王大爷报了名,很快就被批准了。大院所有的街坊都清楚,王大爷这么做,是为了给儿子腾房子。

    王大爷最后一天收摊的时候,我站在一边,默默地看着他。他也望着我,什么话也没说。那一天,小街上冷冷清清的。

    第二天,王大爷走时,我没能看到他。放学回家,看到桌上那只脖子上挂着铜铃铛的小斑马,我的眼泪一下子涌了出来。

    四十多年过去了,王大爷的儿子,今年七十多岁了,他在王大爷留给他的那间东厢房里结了婚,生了孩子。他的媳妇个子很高,长得很漂亮。他的儿子个子也很高,很帅气。可是,王大爷再也没有回来过一次。难道他不想他的儿子,不想他的孙子吗?

    四十多年来,我曾经多次去过甘肃,每一次去,都会想起王大爷,想起这个让我百思不得其解的问题。当然,也会想起那只“泥斑马”。

同类题3

根据短文理解,选择正确答案。

    My writing career began ten years ago with my articles published locally and nationally. As a beginning writer, I was happy to be on my way, writing and learning as much as I could . With two little kids underfoot, as well as working full-time, it was really difficult to make time for writing, but I managed.

    Readers told me they laughed, cried or were inspired by my articles. But they didn't know what was really going on behind the typewriter. I was not a happy mommy, and found it difficult to enjoy the everyday little things in life. In short, I was not a happy person.

    I realized I had to make some changes. I started walking every morning. It cleared my head, allowed me time to think, gave me fresh air, and made me feel invigorated (精神焕发) and healthy. I was eating wisely, and the weight started to go. I started a new job, joined a monthly writing chapter,and was determined to keep up my walking. Finding the balance was sometimes difficult. But I was determined to fit in writing time because it made me happy. Sure I loved to watch the news and have my tea, but that wasn't what made me truly happy.

    My own happiness has shown through my family, my job performance and my attitude towards challenging situations. I again have readers telling me the effect my writing has had on them, with some able to get on with their own writing because of my articles.

    It was up to me to make it happen—my own happiness. One step at a time-one word at a time. And I did it.