一片临河的草丛突然起火，火焰形成一个火圈，向一个丘陵包围过来，丘陵上无数蚂蚁眼看就要葬身火海。这时，蚂蚁们迅速聚集，抱成一团，滚成一个黑色的“蚂蚁球”，尽管被烧得噼啪作响，“蚂蚁球”却越滚越快，终于穿过火海，大多数蚂蚁得以绝处逢生。材料体现的哲理是(　　)  
①办事情要树立全局观念、整体观念 　②搞好局部就能使整体功能得到最大发挥　
③整体功能离不开部分原有的功能　   ④必须掌握系统优化的方法

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。每处错误仅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）每处错误及其修改均限一词;

2）只允许修改10处，多者（从第11处起）不计分。

    One day, in my way to school, I noticed two anxious foreigners was surrounded by a group of people. I stopped and found that they were tourist from Canada who carelessly left a very importantly wallet in a taxi. So I take them to the nearest police station. With help of the policemen, we got in touch the taxi company. We were telling that the wallet had just been found. And two passports, flight tickets, or some money were still inside it. Finally the two Canadians got our wallet back. They thanked for me and left.

文中共有10处错误，每句中最多有两处。每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.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。

    I was sitting at my favorite table in a restaurant on last Sunday waiting for the food I had ordered to arrive. I suddenly found that Lin Ling, one of my classmate, worked as a waitress there. Honest speaking, it was great surprise for me to find her working there. As far as I know, she's from a richer family. What made her work there? I walked up to her but asked her the reason. When asking, she said, “I just want to earn some pocket money so that we can help some children in poor areas go back to school.” How a good girl! I should learn from her.

下列关于动物机体酶、递质和激素的叙述，正确的是

“十一五”期间，我国国民经济保持了持续平稳较快发展，人民生活水平大幅度提高。决定居民消费从低级逐步向较高层次发展的主要因素是