My friend has a big police dog named Kim. Police dogs are often very smart. Every Sunday afternoon my friend takes Kim for a long walk in the park. Kim likes walking very much.
       One Sunday afternoon a man visited my friend. He talked to my friend for a long time. They talked and talked. Soon it was time for my friend to take Kim for his walk, but the man still stayed. Kim became very worried about his walk in the park. He walked around the living-room sometimes and at last sat down in front of the man and looked at him. But the man went on talking.
      After thirty minutes, Kim couldn’t stand(忍受) it. He went out of the room and came back a few minutes later.   He sat down in front of the man again but this time he held the man’s hat in his mouth.

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春秋时期，奴隶社会逐渐崩溃。它在政治上最突出的表现是

阅读有关材料，回答问题。

材料一：北京时间2008年5月12日14时28分，四川省汶川县（北纬31度，东经103.4度）发生里氏8.0级大地震。人员伤亡惨重、生产生活遭受严重破坏、经济损失巨大。

材料二：北京时间2013年4月20日8时2分，在四川省雅安市芦山县（北纬30.3度，东经103度）发生7.0级地震。