The four athletes are from Beijing, Shanghai, Zhejiang and Jilin. In swimming, track and field, table tennis and football, each of them participated in only one sport, and their sports are different. In addition, they only know some fragmentary information: (1) Zhang Ming is a ball player, not a southerner; (2) Hu laochun is a southerner, not a ball player; (3) Zhang Ming is a southerner, not a ball player Li Yong shares the same room with Beijing athletes and table tennis players; (4) Zheng Yonglu is not a Beijing athlete, younger than Jilin athletes and swimmers; (5) Zhejiang athletes did not participate in the swimming competition. According to these conditions, please analyze: where are the four athletes from? What sports do you take part in?

The four athletes are from Beijing, Shanghai, Zhejiang and Jilin. In swimming, track and field, table tennis and football, each of them participated in only one sport, and their sports are different. In addition, they only know some fragmentary information: (1) Zhang Ming is a ball player, not a southerner; (2) Hu laochun is a southerner, not a ball player; (3) Zhang Ming is a southerner, not a ball player Li Yong shares the same room with Beijing athletes and table tennis players; (4) Zheng Yonglu is not a Beijing athlete, younger than Jilin athletes and swimmers; (5) Zhejiang athletes did not participate in the swimming competition. According to these conditions, please analyze: where are the four athletes from? What sports do you take part in?

The solution is as follows: head north to Zhejiang and Jilin, head north to Zhejiang and Jilin, head north to Zhejiang and Jilin, head north to Zhejiang and Jilin, head north to Zhejiang and Jilin, head north to Zhejiang and Jilin, head north to Zhejiang and Jilin, head north to Zhejiang and Jilin