已知：Ⅰ、酸性条件下，铈在水溶液中有Ce³⁺、Ce⁴⁺两种主要存在形式，Ce⁴⁺有较强氧化性；

Ⅱ、CeO₂不溶于稀硫酸，也不溶于氢氧化钠溶液．

回答以下问题：

下列图①④分别与相应的操作过程相对应，其中正确的是 ​

山西五台县佛教盛行，多年流行 “谢土”习俗。一些学校为祈求师生平安，在校园内举行“谢土”仪式，焚香点蜡，下跪祭拜。对此现象，认识正确的是（　　）

阅读《种棵树收留时光 》，回答文后问题。
                                                                                                                              种棵树收留时光
        没有树的院落，就像没有父亲的家，空荡荡的。我发现时，春天已到了。
        那些树，是父亲种的，就像我和姐姐，有着各自葳蕤的时光。岁月不居，姐姐已结婚生子，我也将在城市安家。如同那些树，我们终要长到分叉的年纪，然后分道扬镳。现在父亲卖掉它们，手刃了那段时光。他把钱全都交给我，刚好够买一间卧室。
        我买了新房，父亲卖掉心房。我顾不了这么多，一如父亲和家的衰落。在他面前，我总像个孩子般没用。父亲总有他的办法，哪怕我天文数字的房贷，他眼也不眨一下，淡淡对我说，你工作你的，我想办法。卖掉树，父亲去打工了。这是他全部的办法。他终于明白，那块地能养活全家，却补不了我的城市生活。虽然他谙熟农事，在田地里游刃有余，但到了城里，他就像迷途的孩子，不知所措。
        父亲走了，我回家收拾“残局”。树枝凌乱散落一地，乍绿还黄。枝桠上，叶芽迈着整齐的步子，正饱满地跑向春天，到我面前，却戛然而止。我把它们捡起、码齐、放好，就像收集那些弥足珍贵的往事。
        清理好树枝，接着是树根。树是齐根锯断的，硕大的伤口，像父亲的嘴在喊我。我虽然听不见，但从明灭的年轮里，我能认出那些逝水流年。枣树清瘦，是父亲给我种的，我嘴馋；桃树细腻，是父亲给母亲种的，母亲身体不好，桃树避邪；槐树匀称，是父亲给姐种的，姐喜欢吃槐花……哪一棵是父亲种给自己的呢？我仔细辨认，这些让他疼痛不已的树，竟没一棵是他给自己的。
        扒完树根，坐在寂寞的院落里，我有种被掏空的感觉。
        母亲喊我烧锅。如今家里只剩下母亲，我一回家，她就喊我做这做那。我知道她并不想我干多少，只想我在她面前，让家有些回音和气息。母亲做着饭，说落着父亲：是不是又跑丢了。也不打个电话。吵闹一辈子，她还是关心他。
        我拨通父亲的电话问，习惯吗？父亲不屑地说，有啥不习惯的，工地的活，比种庄稼容易，钢筋扎好，往地上一种，就会长出大楼……父亲变得很健谈。他总是这样，再艰难的事，也说得轻描淡写。
        父亲忽然问，家里的树发芽了吗？我支支吾吾。或许他忘了，家里的树都卖了。父亲喃喃道，应该发了。我轻轻问，还迷路吗？他笑笑，不好意思地说，不迷了，我找棵大树，就有了方向。说起那树，他又来了精神，滔滔不绝。我没想到，竟然是棵异乡的树，引领着他走进城市，而我只能远远旁观着。
        我决定给父亲种棵树，帮他收留那些渐渐老去的时光，让他能找到回家的路。                                     

阅读：根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Have you ever seen any students whose trousers hang so low you can see their underwear? What do you think of that? Fashionable? Some of today's teenagers are big fans of such a look.____.

    The headmaster of a school in central Italy has asked students to stop wearing low-rise jeans that expose underwear and part of the body. His request came after a class trip. One day, he saw one boy's baggy trousers slide to his feet ____.

    But in Italy, a nation that takes fashion very seriously, the suggestion caused a debate among parents, teachers and students. The issue is whether the headmaster's request will limit students' freedom—or whether dress in Italian schools is too casual.

    ____ “We do not want to kick fashion out.” the headmaster explained, “but extremes of fashion like this are not right in school.” Many other schools have now requested that their students also stop wearing such trousers.

    ____ Ludovica Gaudio, 14, wore extremely low trousers exposing orange underwear in class. It was cold, so she wore a matching orange scarf. ____ “I don't really feel comfortable in those sorts of jeans,” said Sarah Lattanzi, “in winter, when dressed like that, it's quite cold and I am afraid my stomach will ache.”

A. But recently this trend has been at the center of an argument in Italian middle schools.

B. A parents' group praised the move in favor of good taste, while others advised schools to stop worrying about fashion and fix up old school buildings.

C. He pointed out that this way of dressing is not suitable for school.

D. Most students have simply ignored the request.

E. Another 14-year-old said she would probably respect the request, simply for practical reasons.

F. Requests.

G. Schools should pay attention to things more important than students' clothes.