读四川省略图答问题:
(1)图中AB分别代表四川东西两大地形单元,请说出它们的地形区名称:
A单元主要是_______________B单元主要是________________
(2)说出图中数码代表的城市和山峰名称:
城市①是__________,城市②是__________,城市③是___________,山峰是④________,   山峰是⑤__________
(3)四川省地域广大,气候多样,地质条件复杂,存在的自然灾害主要有哪些?
                                                                                                                                                                
(4)昔日的四川有“蜀道难,难于上青天”之说。如今的四川,早已天堑变通途,成为大西南的交通枢纽,请你简要说说四川正在建设的主要铁路或公路名称。
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
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