青藏地区农作物主要分布在河谷地带,最主要的自然原因是 A.河谷

青藏地区农作物主要分布在河谷地带,最主要的自然原因是

A.河谷地区有丰富的水源  

B.河谷地区土壤肥沃

C.河谷地区人口稠密,劳动力充足   

D.河谷地区气温较高,风力较小

答案

D

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