题干

A、B、C是单质,其中A是金属,各种物质间的转化关系如图(略去部分反应物和生成物):

上一题 下一题 0.0难度 选择题 更新时间:2013-05-17 11:15:20

答案(点此获取答案解析)

同类题1

课外阅读

父亲的期望

父亲是个修车的,虽年届四十,却略显苍老了,那饱经风霜的脸上,被风风雨雨刻上了深深的皱纹。

打我记事起,父亲便开始忙碌在修车铺里,从早一直到晚,靠着他那仅有的手艺,维持着这个家。虽然整天忙碌,但在人们的眼中,修车的毕竟是一个“低等”的活儿,因此父亲常受到人的鄙视。然而父亲不是一个软弱的人,他不自卑,而是把他仅有的希望和那希望受到安慰的心交付给了我,希望我能胜过他自己,更胜过那些嘲笑他的人们。晚上,父亲拖着疲惫的身子回到家,我一见到他,便兴奋地扑到他怀里。接着,父亲便给我讲一些伟人的故事,虽然他只知道一点, 但这已尽他的所能了 。每当这时,我总是似懂非懂地听着,用我那天真的眼,盯着父亲的那张脸。

不久,我便上学了,这是父亲对我寄托希望最深的时候。父亲为了能让我安心念书,除了白天在修车铺忙以外,回到家还要做家务。有时我真想帮他,但父亲总是笑着对我说:“没事的,你管自己念书。”

一次,父亲带我上街,我好兴奋。到了一家卖鞋的商店时,父亲停住了,他看看我脚下的鞋,说:“这双鞋太破了,太寒伧,还是买双好点的吧,上学哪能没有鞋?”我却说:“爸,不要,我脚下的还能穿,几双跑鞋够穿两年了。”但父亲执意要为我买。接着,为我在柜台下选了双皮鞋,虽然是鞋柜里最便宜的,可我的泪水已在眼中打转了。“拿着,”父亲把鞋放在了我手里,并从找下的钱中拿出一部分给我,折了几折,放在我口袋中,说,“上学时,买东西吃,别空着肚子念书!”

一路上,父亲送我上车,我只是一路沉默,父亲则好像很轻松。半路时,父亲有急事要走了,临走前,他用他那 双粗糙的手,抚摸了一下我的头,轻声说道:“去吧,上学别迟到了,爸晚上来接你。”我吃力地点了点头,看着父亲远去的身影,情不自禁地哭了。

我呆呆地立着,此时此刻的脑子中又浮现出了父亲那张黝黑的脸,那不平凡的脸。我此刻拿着的仿佛不仅是一双鞋,更是父亲的真心和那浓重的一片希望……生活的艰辛消磨了父亲的英俊,但永远消除不掉他的深切期望!

——父亲,走好!儿子我会圆了您的心愿……

同类题5

完形填空

    By the time we reach adulthood, many of us have had the good fortune to have at least one best friend. If we have1around or changed our life situation2,we may be lucky enough to have had several. The best friend relationship is often our earliest3peer relationship, and it can be a source of great warmth and4throughout our lives. The characteristics of best friendship change as we grow up and grow older, but the heart of it remains the 5. Our best friends are a warm shelter in which we feel free to be fully ourselves, to share our deepest secrets, to 6when we are overtaken by tiredness, to have a 7when there is something nice to happen in our life—a place in which we feel completely welcome to give and receive that most 8of all gifts, love.

    Most close relationships do face9from time to time, and one of the characteristics of an enduring best friendship is its ability to10the storms and to remain unbroken even as it faces changes. Our best friends are those who manage to love us through all of our11, as we do the same for them. We find ways to hug and 12the differences between us and offer love and13no matter what. We allow each other to be 14as we are at a given moment, even as we allow each other to change over time.15, best friends sometimes feel like family. We know we will stick together 16we take our individual roads.

    We may be on the phone with our best friends every day, or we may not have17with each other for a year, yet we know that our bond will be strong and18when we do19each other. This bond ties us together even when are apart and draws us delightfully back into the warm20of each other's company when our paths bring us together again.