某研究性学习小组设计了一组实验来探究元素周期律．甲同学设计了如图1装置，根据元素非金属性与对应最高价含氧酸之间的关系，可以一次性完成碳族元素中C与Si的非金属性强弱比较的实验研究；乙同学设计了如图2装置来验证卤族元素性质的递变规律．A,B,C三处分别是蘸有NaBr溶液的棉花、湿润的淀粉KI试纸、蘸有碱液的棉花．已知常温下浓盐酸与高锰酸钾能反应生成氯气．

方程x－2=2x的解是   （      ）

阅读短文，回答问题。

一碗水的愤怒

    在我生命里曾经流淌过一碗水，是这碗水让我懂得了什么是真正的愤怒。

    暑假时，久居都市的我与朋友结伴西北行。七月如火，车子在高高的黄河大堤上爬行。黄河河底龟裂，河水时断时续，给人一种苟延残喘的感觉，全没有“黄河在咆哮”的气势。在黄河拐弯处好不容易才见到了一个村子，村子因树而得名，叫“五棵树村”。在村头有个苗圃，绿绿的一片，让长途跋涉的我们略感一丝凉意。一个小姑娘拿着一个特制的大瓢，在每一棵小树苗根上小心地地滴上一点点水，那动作好像是在轻轻抚摸睡梦中的婴儿。“小姑娘，能不能给点水？”我不停地用毛巾擦着好像永远也擦不干的汗，渴望能洗一把被汗水渍疼的脸。

   小姑娘迟疑了一下，转身走向苗圃后面的屋子，屋子里的椅子上坐着一位老妇人，脸上带着世事洞明的安详。小姑娘轻轻对她说了些什么，老妇人点点头从腰间“哗啦”一声摸出一串钥匙一这时我才看见在屋子和苗圃之间有一眼水窖，水窖设有坚固的木盖儿，木盖儿上牢牢地锁着一把大铁锁。

    只见小姑娘轻盈地走到水窖前，熟练地打开大铁锁，用一个小木桶小。小心地汲出一点水，倒进一个干净的陶瓷碗里。她双手捧着那碗，像捧着整个世界一样走到我面前说：“走远路渴了吧，快喝吧！”我看了一眼，那水里竞漂浮着一些细小的杂物，在白瓷碗里显得更浑浊。

    本来我是想洗把脸凉爽一下。喝的水我们自带了许多瓶纯净水。等小姑娘转过身去继续 “滴”她的水后，我让同伴把那碗水倒出来，开始洗脸。

    听到水落地的声音。老妇人和小姑娘不约而同地投来愤怒的目光。老妇人从椅子上站了起来，喊了声：“作孽呀！”突然摔倒了。小姑娘却不去扶老妇人，只是惊叫着冲到我身边，一把抢过我同伴手中的水碗，然后竞倒在地上，伸开双手用力挖起我脚下那一点被水浸湿的土，捏成一个泥团，迅速跑到苗圃旁新栽的小树边，深挖了一个坑，把湿泥团贴着树根埋下，这才急切地叫着“奶奶”向老妇人跑去，慢慢把她搀扶到椅子上。

    我被眼前这一切惊呆了，一时不知道自己该做些什么。良久，我们才从小姑娘口中知道，这村周围黄河大堤旁的小树苗都是那位老人家培育出来的，这水窖也是老人家挖的。前年大旱， 水窖里也难以存住水了，为了让刚栽上的小树苗能够成活，老妇人翻山越岭到二十余里外的地方去挑水，不料半路上一脚踏空，瘸了一条腿。

    老妇人叹了口气，意味深长地说：“不是我小气，这样热的天，我的苗圃一天才用一瓢水，你们不知道缺水的苦，这样糟蹋水，我心疼呀！”

句子还原，阅读短文，根据短文内容，从所给选项中选出五个句子完成短文。

Body language is one of the most powerful means of communication.____ people around the world show all kinds of feelings, wishes and attitudes that they might never speak aloud.

The most universal facial expression is the smile. People usually smile to show happiness and make people feel comfortable.But sometimes it doesn’t always mean that we are truly happy, however, smile around the world can be false, hiding other feelings like anger, fear or worry.____ However, the general purpose of smiling is to show good feelings.

     From the time we are babies, we show unhappiness or anger by frowning.____ Making a fist and shaking it almost means that someone is angry and threatening another person.

     There are many ways around the world to show agreement ,but nodding the head up and down is used for agreement almost worldwide.____ 

How about showing that I am bored? Looking away from people will make me appear to be uninterested. However, if I turn toward and look at someone or something, people from almost every culture will think that I am interested. If I roll my eyes and turn my head away, I most likely do not believe what I'm hearing or don’t like it.

Be respectful to people is subjective, based on each culture. but in general it is probably not a good idea to give a hug to a boss or teacher.____with so many cultural differences between people .it is great to have some similarities in body language. We can often be wrong about each other. So it is an amazing thing that we understand each other as well as we do.

1. A.Most people also understand that shaking the head from side to side means disagreement or refusal.
2. B.There are unhappy smiles, such as when someone “loses face” and smiles to hide it.
3. C.It is often even more powerful than spoken language.
4. D.People around the world show how their feelings in quite different ways.
5. E.Standing at a little distance with open hands will show that I am willing to listen.
6. F.In most places around the world, frowning and turning one’s back to someone shows anger.

某学生利用如图所示的装置制备某种干燥纯净的气体，其中A中盛放一种密度比B中密度小的液体，符合题意的选项是(　　)