1. (2018南京)Yingqi Bird Nest Library, the smallest library in the world, was opened to the public in Nanjing's Huashu Village ________ the World Reading Day this year.
A. on　　　　　B. in　　　　　C. at　　　 　D. as
1. A【解析】考查介词表示时间的用法。句意：世界上最小的图书馆，嘤栖鸟巢图书馆于今年的“世界读书日”那天在南京桦墅村对公众开放。具体到某一天用介词on。故选A。