地球上昼夜现象的产生原因是 A.地球的自转    B.地球的公转  C.地

地球上昼夜现象的产生原因是

A.地球的自转    B.地球的公转 

C.地球本身不发光不透明   D.地球上大气层的存在

答案

C

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