题干

在下列实数中,无理数是(  )

A:2

B:3.14

C:-12

D:3

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答案(点此获取答案解析)

D

同类题2

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    When I spent the summer with my grandmother, she sent me down to the 1with a list, I walked up to the counter.Behind it was an old lady named Miss Bee.
    “Excuse me,”I said. She 2“I need to get these,”I continued, 3up my list.
    “So? Go get them,”Miss Bee said.“4is here except you and me, and I'm not your servant. I suggest you get yourself a basket over there and start5.”It was not 6for a 7­ year ­old child, there were so many different kinds of things. I spent over an hour in the store.
I visited Miss Bee twice a week that summer. She 7short­changed me. Other times she overcharged. Going to the store was like going into a war. But by the end of that summer, I could finish my shopping trip8around 15 minutes. The morning I was to return home, I stopped in the store again to buy something.
    “All right,”Miss Bee said. “What did you 9this summer?”
    “That you're mean!”I replied.
    Miss Bee just laughed,“ I know 10you think of me,”she said. “Well, I don't care! My job is to teach every child I meet some life 11. When you get older you'll be glad that you met me!”Glad I met Miss Bee? Ha!How could it be?
    It sounded funny until one day my son came to me with his homework. “It's too 12 . ”he said. “Could you finish the math problem for me?”
    “13I do it for you, how will you ever learn to do it  yourself?”I said. Suddenly, I was back in that store where I had learned to add up my bill by myself. Had I ever been overcharged since?
    Life is full of all kinds of 14. We may be 15 a hand once or twice, but luck may not find us every time. So we should work them out by ourselves.

同类题4

阅读下文,完成练习。

乡情

陈德才

    ①凡少小离家的人,都有一份永远也化不开的浓浓的乡情。故乡的那棵挂着一丛丛嫩绿榆钱儿的大榆树,那片成群鹅鸭浮游欢叫的清水塘,那个与小伙伴儿捉迷藏的打谷场,那条夏日里去游泳、摸鱼的弯弯曲曲的小河,都构成了人们一个个最美丽的梦境。

    ②古诗云:(甲)许多动物都有一种对自己出生地的深深依恋,差不多已经构成了一种本能。人作为具有思想感情的高等动物,赋予这种本能以更多的社会性,将其提升为对故乡这块热土的深切执著的爱。一个人喝着家乡的水,吃着家乡的五谷杂粮,在乡亲们的眼皮底下一点点长大;在家乡的小学校里认第一个字,读第一本书;________从家乡的田林山水开始,逐渐认识和走进这个神秘而广袤的世界。于是,对故乡的爱,就在这一过程中很自然地滋生于每个人的心灵深处,有着任何其他情感所难以比拟的深厚根基。

    ③乡情总是离不开童年的回忆。童年时的所见所闻和遇到刺激,在一个人大脑皮层中形成最初的沟回,打下最深的烙印。天地间走来一个小小的我,没有功利的权衡,不需要礼仪的拘谨,高兴就笑、就跳,不高兴就哭、就闹,何等自然纯真,洒脱无羁,世界万物都散发出天真烂漫的气息,使童年的岁月宛如一首无尽延伸的诗。人过中年,再也找不回儿时对陌生世界的那种新奇感,找不回那种全神贯注和真诚纯洁的目光。因此,人们怀念故乡,在一定意义上也是对自己纯真无邪的童年的怀恋,是企图追回生命中失落的那一段无比珍贵的时光。

    ④(乙)对于流寓他乡的游子,一句乡音就足以令他热泪盈眶,心起波澜。对故乡的爱,是(丙),是对生命春天的珍惜,是一个人最真诚炽热的感情。其实,什么叫祖国?就是生于斯、长于斯的故乡的放大,就是自己生命系列的源头。海外华侨以及外籍华人,都是“中国老乡”,他们对祖国的刻骨铭心、永无停歇的挚爱,就是乡情的凝聚与升华。

    ⑤尽管远在异国天涯,游子们都有一种回故乡探访的永恒冲动,向往着(丁)的难得体验。但是,如果经过苦心筹划,有一天你真的回到阔别已久魂牵梦绕的故乡,在夙愿得偿、感叹唏嘘之余,也一定会有一种很强烈的陌生感和失落感:再也找不到那熟悉的小路、熟悉的杨树林,小河也不再那样宽阔、那样富有生气。其实是一切中年之后回乡的人都会产生的一种典型心境。这不仅仅是因为白云苍狗、世事沧桑,还由于当年的小孩已长成大人,衡量外部世界的尺度不同,心境也变了。因此,故乡只能停留在回忆中,驻守在梦境里,在现实生活中将永难寻觅。

    ⑥乡情是一杯酽酽的茶、醇醇的酒。如果经常地品一品,就会在眼前时时闪现家乡父老殷切的目光,就会保持更多的质朴、与真诚,就会保留一份永恒的平民情结和赤子之心。