When you take a walk in any of the cities in the West, you often see a lot of people walking dogs. It is still true that dog is

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问题    When you take a walk in any of the cities in the West, you often see a lot of people walking dogs. It is still true that dog is the most useful and【T1】______animal in the world, but the reasons why people keep a dog have changed. In the old days people used to train dogs to protect themselves against【T2】______by beasts. And later they came to realize that a dog was not only useful for protection but【T3】______to obey his master. For example, when people used dogs for hunting, the dogs would not eat what was caught without【T4】______. But now people in the city need not protect themselves against attacks of animals. Why do they keep dogs, then? Some people keep dogs to protect themselves from robbery. But the most important reason is for【T5】______So the main reason why people keep dogs has changed from protection to friendship.  
【T4】
When you take a walk in any of the cities in the West, you often see a lot of people walking dogs. It is still true that the dog is the most useful and faithful animal in the world, but the reasons why people keep a dog have changed. In the old days people used to train dogs to protect themselves against attacks by beasts. And later they came to realize that a dog was not only useful for protection but willing to obey his master. For example, when people used dogs for hunting, the dogs would not eat what was caught without permission. But now people in the city need not protect themselves against attacks of animals. Why do they keep dogs, then? Some people keep dogs to protect themselves from robbery. But the most important reason is for companionship. So the main reason why people keep dogs has changed from protection to friendship.

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答案permission

解析 permission意思是“允许,许可”,without permission意思是“未经许可”。
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