亚里士多德说：“慷慨是挥霍与吝啬之间的中庸，庄重是自傲与顺从之间的中庸，谦谨是无耻与羞怯之间的中庸……”下列有关亚里士多德对“中庸之道”的看法不正确的是(　　)

如图所示，质量分别为M和m的物体用细线连接，悬挂在定滑轮上，定滑轮固定在天花板上，已知M＞m，对滑轮及线的重量、摩擦不计，求细绳对天花板的拉力的大小？

根据短文内容选择正确答案。

    Many animals hide to stay alive. They hide in many ways. Some animals hide in leaves; some animals hide in snow. Usually their colors or shapes help protect them. It's hard to see an Arctic bear in snow. Its white fur helps protect it. Chameleons(变色龙) can hide by changing colors. Their skin turns the same color as what is around them. Some chameleons can change colors in five minutes.

    Many animals try to look bigger than they are to stay alive. Some animals can make other animals think they are very big. If they look very big, animals that are looking for food will run away. Bears can walk on two legs. They look very, very scary. Some animals will run away from them.

Many animals try to stay around other animals. This helps them stay alive. Zebras stay close together so that they can help each other look out of danger. Seeing many stripes at once can also confuse animals that want to eat them. Some birds stay in a circle, each toward a different direction. In this way they can also help each other stay alive by looking around for animals that many want to eat one of them.