一个正方形，六个面上分别写着六个连续的整数，且每个相对面上的两个数之和相等，如图所示，你能看到的数为7、10、11，则六个整数的和为(    )

已知中心在坐标原点，焦点在x轴上的椭圆，离心率为 $\frac{\sqrt{6}}{3}$ 且过点（ $\sqrt{5}$ ，0），过定点C（﹣1，0）的动直线与该椭圆相交于A、B两点．

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。短文中共有10处错误，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：在缺词处加一个漏词符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用（﹨）划掉。

修改：在错的词下面划一横线，并在该词的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。

    A young man called Low­Carbon Brother become a hit on the Internet in 2011. He is still active in protecting the environment. He suggests living a low­carbon life, which means using less energy in our daily life so that we can help reducing carbon dioxide in the air. For example, she always picks up some waste paper on the street or uses the blank side to write something. While he is watching TV, he always turns up the screen brightness to the minimum and turns off the light. Therefore, he goes to work by bike instead of driving. Some people think what he is doing is just a show. No one can live such a simply life with so many modern invention around us. As far as I am concerned, I am strongly in support his idea and his behavior. Although what he is doing has no huge effect on global warming, but he at least can enjoy a healthy life.