Rose is an American schoolgirl. She is now in Beijing with her parents.
       It's Sunday morning. Rose gets up early in the morning. After breakfast her parents take her to the zoo. They go to see the pandas and other animals. The pandas live only in China. There are not any pandas in America. So they like the pandas best. Outside the zoo gate there is a picture. It's a picture of panda with “welcome”. In the zoo, Rose sees not only panda but also many other animals.
    The panda is round and fat. It looks like a ball. It always moves slowly like a ball rolling. There are also elephants. The elephant is the biggest animal on land. There are many monkeys on the hill. Some of them are sitting in the trees. Some are picking nuts. And the others are running or climbing up the trees. Rose and her parents have a good time in the zoo.

已知点F是双曲线 $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ （a＞0，b＞0）的左焦点，点E是该双曲线的右顶点，过F且垂直于x轴的直线与双曲线交于A、B两点，若△ABE是锐角三角形，则该双曲线的离心率e的取值范围是____．

科研人员对某岛屿连续两年中社鼠种群数量和性比（♀：♂）进行研究，结果如图，据图分析正确的是（    ）

下列动物中，不属于恒温动物的是（    ）

一般的雕版印刷书籍,每页不过一百多个字，比如四库全书，每页仅为182字。对于追求信息含量、讲究内容厚实的近现代报纸而言，若仍用雕版印刷出版报纸，那简直如同派小脚女人参加奥运会100米赛跑。这段材料主要说明(  )