60-10/2=55

来源: FHZM 于 2012-04-13 20:35:03 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (0 bytes)
回答: how long had she been walking? 由 lilipp 于 2012-04-13 19:31:40
请您先登陆，再发跟帖！