题目

       Volunteers, as an essential part of a successful world exposition, are a major channel for the public to participate in, serve and share the world exposition and a means to showcase the image of the host country and city. The following information is about the volunteer for the World Exposition 2010 Shanghai China． I．Basic Requirements for Volunteers                         ●  Be willing to participate in voluntary services of Expo 2010;       ●  Age limit: Expo Site volunteers must be born before April 30, 1992 and Expo City VoluTurn left _____ the hospital, then go straight. （ ）A. on B. at C. in