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【简答题】
阅读材料，回答下列问题． 材料一长绒棉是由美洲的海岛棉经过改进培育出来的，特别是其纤维的长度、细度和强力等方面都要比陆地棉要好，长绒棉的纤维长度通常在31毫米以上，人们将纤维长度35毫米以上的称为超长绒棉． 材料二埃及是世界上长绒棉产量最大的国家，长绒棉纤维长度在33.4-40毫米之间，主要产于北非尼罗河下游的绿色走廊和三角洲． 材料三长绒棉的生长需要肥沃的土壤，充足的光照，生长初期需要有充足的水源，生长后期需要晴朗的天气． （1）埃及为什么要引进改进培育的美洲海岛棉？美洲海岛棉适合在埃及生长吗？ （2）埃及大部分地区属于什么气候类型？这种气候类型有何特点？对于长绒棉生长有何优缺点？ （3）为什么埃及长绒棉集中分布在尼罗河河谷和三角洲地区？
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