中国最大沙漠淡水湖红碱淖，近二十年间湖面面积已“缩水”了25. 5平方公里，自2000年以来，红碱淖水体面积下降趋势明显。2011年后，每年减少水体面积在1平方公里内。专家分析，如红碱淖水位继续下降，将使该区域生物链内的动植物受到威胁，同时，红碱淖也很有可能成为“第二个消失的罗布泊”。回答下列问题。

小涛用一块矩形的硬纸板在阳光下做投影实验，通过观察后，他发现这块矩形硬纸板在平整的地面上不可能出现的投影是（　　）

最早提出“富贵不能淫，贫贱不能移”的道德准则的思想家是(      )

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。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。

    Three years ago, I went to a boarding school. The reason for my attended such a school was that my parents was very busy. They often went abroad on business but had no time to take care of myself. Besides, they thought I ought learn to be independent. Honest speaking, the school life does benefit me a lot. I not only learned some ways to solve problem on my own but also learned how to get along with others. But that I treasure most now is the friendship that I developed into at that time. How I miss that wonderful time!