(1)根据材料一,说明西北地区自然环境的整体性和差异性。 _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ (2)根据材料二,说明新疆维吾尔自治区耕地、林地的分布特征。并分析说明影响新疆种植业的有利区 位因素。 _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ (3)据史料记载和考古发现,自西汉开始经唐宋到二十世纪的50年代,位于昆仑山麓的耕地面积呈逐渐 缩小且有从沙漠边缘向山前后退趋势。分析说明造成这一现象发生的原因。 _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ |