题干

某合作学习小组讨论辨析下列说法,其中正确说法的数目为(   )

①碱性氧化物都是金属氧化物,酸酐都是氧化物

②AlCl3溶液和Al(OH)3胶体的本质区别在于是否有丁达尔效应

③若规定0.024kg12C含有的原子数为阿伏加德罗常数,则标准状况下44gCO2的体积约为44.8L

④标准状况下,气体体积的大小取决于粒子数目和粒子间的平均距离

⑤同温同压下,等质量的二氧化硫气体和二氧化碳气体密度比为16:11,体积比为11:16

⑥把0.05mol氢氧化钡固体加入到100mL 1.0mol/L盐酸中,溶液导电性基本不变

⑦活泼金属钾、钙、钠、镁、铝均由电解对应的熔融氧化物制得

⑧合金熔点、硬度都低于成分金属,青铜是使用最早的合金,钢是用量最大用途最广合金

⑨工业合成氨是人工固氮的主要方法,工业生产玻璃、水泥都需要用到的原料是石灰石.

A:3

B:5

C:4

D:7

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答案(点此获取答案解析)

A

同类题2

根据短文内容,选择最佳答案。

    With the development of science and technology, new inventions, especially new electronic products, have made people's lives easy and convenient. But as the saying puts: A coin has two sides.

    One day, I was walking in the park with a friend and his cell phone rang, interrupting our conversation. There we were, walking and talking on a beautiful sunny day and…I became invisible, absent from the conversation.

    The telephone used to connect you to the absent. Now it makes people sitting next to you feel absent. Why is it that the more connected we get, the more disconnected I feel? Every advance in communications technology is a tragedy to the closeness of human interaction. With email and instant messaging over the Internet, we can now communicate without seeing or talking to one another. With voice mail, you can conduct entire conversations without ever reaching anyone. If my mom has a question, I just leave the answer on her machine.

    As almost every contact we can imagine between human beings gets automated, the alienation(疏远) index goes up. You can't even call a person to get the phone number of another person any more. Directory assistance is almost always fully automated.

    Pumping petrol at the station? Why say good morning to the attendant when you can swipe(刷)your credit card at the pump and save yourself the bother of human contact?

    Making a deposit at the bank? Why talk to a teller who might live in the neighborhood when you can just insert your card into ATM?

    Pretty soon you won't have the burden of making eye contact at the grocery shop. Some supermarket chains are using a self-scanner so you can check yourself out, avoiding those check-out people who look at you and ask how you are doing.

    I am not against modern technology. I own a cell phone, an ATM card, a voice mail system, and an email account. Giving them up isn't wise…they're a great help to us. It's some of their possible consequences that make me feel uneasy.

    More and more, I find myself hiding behind e-mail to do a job meant for conversation. Or being relieved that voice mail picked up a call because I didn't really have time to talk. The communications industry devoted to helping me keep in touch is making me lonelier.

    So I've put myself on technology restriction: no instant messaging, with people who live near me,no cell phoning in the presence of friends, no letting the voice mail pick up when I'm at home.

同类题3

阅读《我的叔叔于勒》选段,完成小题。

       我父亲脸色早已煞白,两眼呆直,哑着嗓子说:“啊!啊!原来如此……如此……我早就看出来了!……谢谢您,船长。”

       他回到我母亲身旁,是那么神色张皇。母亲赶紧对他说:“你先坐下吧!别叫他们看出来。”

       他坐在长凳上,结结巴巴地说:“是他,真是他!”然后他就问:“咱们怎么办呢?”母亲马上回答道:“应该把孩子们领开。若瑟夫既然已经知道,就让他去把他们找回来。最要留心的是别叫咱们女婿起疑心。”

       父亲神色很狼狈,低声嘟囔着:“出大乱子了!”

       ……

       我看了看他的手,那是一只满是皱纹的水手的手。我又看了看他的脸,那是一张又老又穷苦的脸,满脸愁容,狼狈不堪。我心里默念道:“这是我的叔叔,父亲的弟弟,我的亲叔叔。”

       我给了他十个铜子的小费。他赶紧谢我:“上帝保佑您,我的年轻的先生!”

      等我把两法郎交给父亲,母亲诧异起来,就问:“吃了三个法郎?这是不可能的。”

       我说:“我给了他十个铜子的小费。”

       我母亲吓了一跳,直望着我说:“你简直是疯了!拿十个铜子给这个人,给这个流氓!”她没再往下说,因为父亲指着女婿对她使了个眼色。

       后来大家都不再说话。

       在我们面前,天边远处仿佛有一片紫色的阴影从海里钻出来。那就是哲尔赛岛了。

       我们回来的时候改乘圣玛洛船,以免再遇见他。