Nowadays, many many people have pets like dogs, cats and fish. They're all our best friends. But among all of them, dogs are one …
Nowadays, dogs also help the police and the officers at the airport to make the city safe. They also help the blind people and farmers …
dogs are our best friend英语作文Nowadays there are so many animals out there make people in real life happier. Dog is the best …
更多内容请点击：How Dogs Became Our Best Friends | Scientific American