题目

When you take a walk in any of the cities in the West, you often see a lot of people____41____ (walk) with 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_____42_____(change). In the old days, people used to train dogs to protect themselves against the attacks from____43____beasts. And later they came_____44_____( realize) that the dog was not only useful____45____willing to obey its master. For example, when people used dogs for hunting, the dogs would not eat what they caught without_____46_____(permit). 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 _____47_____(important) reason is for companionship. For a child,____48____dog is his best friend when he has no friends to play with; for a young couple, a dog is ____49____child when 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____50____protection 答案：41. walking    42. have changed    43. other    44. to realize    45. but (also)    46. permission    47. most important    48. a    49. their    50. from

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