【正确答案】One thing shocked me in the America is the cultural difference between China and America. One of my American friends, a professor in a university, has a boy at five when I was there. Such a little boy had a girlfriend at five too. The boy always invited her wherever his family went. The first time I met her the little boy introduced her to me: "This is my girlfriend." I couldn’t help laughing. He seriously answered my laugh: "Do you think I am going to marry her? No way!" How different the two cultures are at the point of having a girlfriend.