【单选题】The plan for unity under a federal system ______ into effect in 1782.
【简答题】潍坊风筝博物馆是目前世界上建筑面积最大的风筝专业博物馆。 ( )
【单选题】Although it was not named ______ 1782, this kind of metal was used as early as 5300 B. C.
【简答题】世界上森林面积最大的国家是_______,有“世界最大露天博物馆”之称的是_______。
【简答题】A.In 1636. B.In 1638. C.In 1836. D.In 1782.
【单选题】When was the building built?