求牛津7A U2的 dogs are our (best) friends 文章,100的悬赏分

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Many people have pets like dogs, cats and fish today. They're all our best friends. But among all of them, dogs are one of the cleverest animals as our pets. They're also lovely and helpful. Long long ago, people kept a dog as a pet because it could guard the caves they lived in. Early men could use tools to hunt animals but they couldn't run very fast, so they also kept a dog to help them hunt animals for food. Today, dogs also help the police and the officers at the airport to make the city safe. They help the blind people and farmers to do many things,too. As everyone known, dogs are our best friends. We mustn't be cruel to them. We must take good care of them.