According to the passage, what were dogs trained for in the past?

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问题 According to the passage, what were dogs trained for in the past?
  
When you walk in any of the cities in the West, you often see a lot of people walking dogs. It is still true that a dog is the most useful and faithful animal in the world, but the reasons why people keep a dog have changed. In the past people used to train dogs to protect themselves against attacks by other beasts. And later they came to realize that a dog was not only useful for protection willing to obey his master. For example, when people used dogs for hunting, the dogs would not eat what was caught without masters’ 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. For a child, a dog his best friend when he has no friends to play with. For young couples, a dog their child if they have no children. For old couples, a dog is also their child when their real children have grown up. So the main reason why people keep dogs has changed from protection to friendship.

选项 A、Because they did not eat other animals.
B、Because they were useful for protection.
C、Because they were good hunters.
D、Because they always obeyed their masters.

答案D

解析
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