It s about 400mm rain in this area______a year.A.above allB.of allC.on averageD.for averag

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It s about 400mm rain in this area______a year.

A.above all

B.of all

C.on average

D.for average

请帮忙给出正确答案和分析,谢谢!

热搜:可见光的波长范围是400~760nm,用平行的白光