这里有湛蓝的天空,绵延的雪山,无边的草原,成群的牦牛,虔诚的

这里有湛蓝的天空,绵延的雪山,无边的草原,成群的牦牛,虔诚的喇嘛,同时这里也是我国生态环境最脆弱的地区。据此完成问题。

该地区农作物单产量高的自然原因是

A.二氧化碳浓度高                          B.气温高

C.光照强,昼夜温差大                      D.降水量适中

答案

C

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