题目

Volunteers, as an essential part of a successful world exposition, are a major channel for the public to join in, serve and share the world exposition and a means to show 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 join in voluntary services of Expo 2010;   ● Age limit: Expo Site volunteers must be born before April 30, 1992 and Expo City Voluntary       Service Station volunteers before April 30, 1994;    ● Obey the la一个足球重450（    ），小明的体重大约是38（    ）。