下面是一些物质粒子的示意图，“○”、“●”、“”分别代表不同种类元素的原子，其中可能属于氧化物的是(    )

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改仅限一词。2. 只允许修改10处，多者（从第11处起）不计分。

    How is everything going with you? As for me, I have a great news to share—I will finally get to be in a book!

    Last Saturday morning, Dad and I were eating breakfast while we heard a knock on the door. I rushed to open the door. It was our neighbor Miss Lydia, that draws pictures for children's books. Miss Lydia greeted me with a smile, looking happily to see me. Remembering my best manner, I said, “Hello, Miss Lydia. Won't you come in?” Miss Lydia came in, sitting at the breakfast table, and said to my dad that he would like both of us to be her models in one of her books! I jumped off my chair and run to give Miss Lydia a big hug.

    I hope my first model experience will be both enjoyable or unforgettable. I'm looking forward to hearing you soon.

计算：$\sqrt{3}$（$\sqrt{3}$-1）﹣|$\sqrt{3}$-2|

简答题。