(12分)下图是我国某区域图,据此回答下列问题:

(1)试描述图中东部-20℃等温线的分布特点,并分析其原因。(3分)
                                                                           
                                                                           
                                                                           
(2)简述图中A河流的水文特征。(2分)
                                                                           
                                                                           
                                                                           
                                                                           
(3)图示地区的主要农业地域类型是         ,其种植的农作物主要是                   。(3分)
(4)该地区农业发展最主要的限制因素是                          。(1分)
(5)简述B城所在省区发展能源工业的优势条件。(3分)
                                                                           
                                                                           
                                                                           
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