下图是我国部分地区略图,据图及结合所学知识回答下列问题。
(1)京九铁路位于                 铁路和                铁路两大铁路干线之间。该线与长江的交点是                
    (城市),此城市附近有湖                (名称)。该线与陇海铁路线交点是                  (城市),该
    城市位于                 省(名称)。
(2)京九铁路建设的主要区位因素有:
    ①                                                                                                                                
    ②                                                                                                                                 
    ③                                                                                                                                 
    ④                                                                                                             
(3)图中A和B两地分别建有我国两个大型钢铁企业,影响两地该工业布局的最主要区位因素分别为:
    A____________________________                                                                                                     
    B___________________________                                                                                                       
(4)C城市兴起的最主要区位因素是_______________                                                                          

(5)图中甲、乙两个阴影所在地区商业网点的显著差异是:
    甲                                                                                                                                                     
    乙                                                                                                                                                     
    原因是 __________________________________________________                                                        
                                                                                                                                                                
                                                                                                                                                             

    两块北京城墙砖被运往美国的一所著名大学,安放在该校博物馆突出位置。旁边的牌子上写道:“这两块北京城墙砖的历史比美国的历史还要长”。北京的古城墙虽然被拆毁了,可北京作为古都的历史却永远记在人们心中。回答下列问题。
(1)历史上曾有哪些朝代在北京定都?当时的都城叫什么?
    _______________________________________________________________________________________
(2)北京作为今天的首都,其城市的主要职能应是全国的________中心和________中心。
(3)北京经济发展中应如何利用“古都”这一特点?
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
(4)北京市的中心商务区在__________________,商业网点的长期发展变化体现了____________思想。
(5)天安门广场位于北京市中心,这里交通便捷,但是却看不到摩天大楼,其原因是什么?
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
(6)明清北京城的城市地域结构有何特点?
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
(7)近年来有学者提出我国应该迁都,其理由有哪些?
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
    _________________________________________________________________________________________
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