我国青藏高原农业小麦一直保持高产状况,其主要原因是 (    

我国青藏高原农业小麦一直保持高产状况,其主要原因是                     

A、雨量充沛          B、温度高       C、昼夜温差大        D、土壤肥沃 

答案

C

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