宠物是我们的朋友还是敌人？ Pets--Our Friends or Enemies?
Nowadays, pets become so close and friendly to our human-beings that more and more people enjoy keeping them. Pets can bring them a lot of joys and happiness, because playing with pets is a good way to communicate with the nature.如今，宠物跟人类的关系都很亲密和友好，越来越多的人也喜欢养宠物。宠物可以给他们带来很多快乐和幸福，因为和宠物玩耍是一种与大自然交流的好方法。
Besides, pets can comfort old people who live alone. With the companion of pets, they won’t feel lonely. Nevertheless, I’m not interested in keeping pets at all.
For one thing, keeping pets is bad for environmental protection, since pets usually make a lot of noise and contaminate the roads.
For another, the virus carried by pets may cause fatal disease. What’s more, sometimes pets may attack people when they are unhappy.
Consequently, we had better not keep too many pets, so as to ensure our health and security. Besides, those pet lovers must take some effective measures to prevent their pets from hurting people and polluting our environment.