读我国南方某河流中下游地区不同发展阶段的示意图,回答问题。

(1)从阶段一到阶段二,甲地农业生产方向发生了明显的变化,以水稻种植业为主,变为   

                 ,发生这种变化的原因是                                         

                                                                                

(2)从阶段一到阶段二,该地工业结构和工业布局发生的变化是                                            

                                                                               

(3)乙、丙两个工业区形成的区位条件分别是                                         

                                                                                

                                                                                

                                                                                

(4)从阶段一到阶段二,该地交通(方式与布局等)发生的变化是                                                    

                                                                               

(5)分析城市工业用地的变化趋势                                     ,其主要原因是                                                                              

(6)从阶段一到阶段二,该地采取的有效保护环境措施有                              

                                                                               

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