根据建国以来我国人口与耕地变化情况分析回答:
 
(1)建国以来我国人口数量呈现什么特点?我国人均耕地变化又有什么特点?
                                                                                                                                                                
(2)我国人口与耕地关系中,存在着怎样突出的问题?产生这一问题的主要原因是什么?
                                                                                                                                                               
                                                                                                                                                                
(3)为了解决上述问题,我国的基本国策是什么?
                                                                                                                                                                
                                                                                                                                                               
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