下图为我国某地区示意图,回答下列问题。
(1)比较乙、丙两区域植被类型的差异及产生差异的原因。
                                                                                                                                                               
                                                                                                                                                               
(2)分析甲地区发展农业的自然区位优势。
                                                                                                                                                               
(3)在秋末冬初或冬末春初,甲地区常产生的主要自然灾害有哪些?
                                                                                                                                                               
(4)甲地区有密集的灌溉渠道和排水渠道,分析该地区排灌结合的优势条件及对土壤的有利影响。
                                                                                                                                                               
                                                                                                                                                               
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