In the selection of volunteers for the 20 10 Shanghai World Expo, three college students from Shanghai Tongji University, Shanghai Jiaotong University and Shanghai Normal University, Li Zhi, Wen Wen,

Judging from the topic, Chinese is not in Jiaotong University, but a city volunteer, while Wen Wen is not a social volunteer.

People in the same university are not volunteers, so Wen Wen is in Shanghai Normal University.

Because Li Zhi is not in the same university, it can be concluded that Li Zhi is in Shanghai Jiaotong University.

So Li Zhi is a city volunteer of Jiaotong University.

So choose: a.