单项选择题
“长三角”地区和环渤海地区都位于我国东部平原．但“长三角”地区铁路运输比重明显小于环渤海地区，制约“长三角”地区铁路网建设的最主要因素是（）。
A.土地价格高
B.劳动力工资水平高
C.河网密布
D.降水丰富．洪涝灾害频发
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