康熙皇帝曾发出感慨：“臣下可仕则仕，可止则止，年老致仕而归，抱子弄孙，犹得优游自适；为君者勤劬一生，了无休息。”这一现象本质上反映了(　　)

—About three           yuan.

    Mike is a football fan. There is a football match between Chinese team and American team. He wants to watch it. He comes to the box office and gives the clerk 10 yuan. The clerk says, “Please give me another 10 yuan. The price of a ticket is 20 yuan.”

    “Why?” says Mike, “I just watch Chinese team. I don't want to watch the other team at all. Do you want me to buy a ticket for it?No, no, no...”