Which of the following,according to the passage,is a list of three natural sources of radiation?( ) A.Radioactive potassium in bone,strontium 90,uranium ore. B.Carbon 14 in tissues,cosmic rays,X rays. C.Cosmic rays,radioactive potassium in bones,radioactive carbon in tissues. D.X rays,carbon 14,plutonium.


Which of the following,according to the passage,is a list of three natural sources of radiation?( )

A.Radioactive potassium in bone,strontium 90,uranium ore.
B.Carbon 14 in tissues,cosmic rays,X rays.
C.Cosmic rays,radioactive potassium in bones,radioactive carbon in tissues.
D.X rays,carbon 14,plutonium.

参考解析

解析:细节题。根据文章第一段首句可知,辐射有三种自然来源,即环境中的放射性物质如土壤、岩石或建筑材料,宇宙射线,以及人体内的物质,如骨骼中的放射性钾以及组织中的放射性碳,C项正确。

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