The earth moves round the sun, and the moon goes round the earth. When our part（部分）of the earth turns to the sun, it is day, When our part of the earth turns away from the sun, it is night. The sun is much bigger than the moon. But sometimes the moon looks bigger than the sun, because it's much nearer to the earth. The sun is very bright. It gives a very strong light. The moon looks quite bright, too. But it doesn't give any light at all. The moon looks much bigger and brighter than the stars. But actually（事实上）, the stars are much bigger and brighter than the moon. They look smaller than the moon because they're much farther away from us.

直线l经过椭圆的一个顶点和一个焦点，若椭圆中心到l的距离为其短轴长的 $\frac{1}{4}$ ，则该椭圆的离心率为（　　）

“枉自称男儿，甘受倭奴气；不战送河山，万世同羞耻。吾侪妇女们，愿往沙场死；将我巾帼裳，换你征衣去。”何香凝寄给蒋介石的这首诗，表达了她的什么感情(    )

从甲乙丙三人中任选两名代表，甲被选中的概率为（　　）