根据短文或对话，选择正确的答案。

Mr Smith lives in a village， but he works in a big city. He goes to work by train every morning and comes home in the same way.

This morning， when he is reading his newspapers（报纸）on the train， a man behind him says "Hello" to him and begins to talk t him. "Your life is not interesting， is it? You take the same train every morning， and you always sit in the same seat and read the same newspaper." "How do you know all that about me?" Mr Smith say angrily（生气地）. "Because I always sit in the same seat behind you，" the man answers.