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O、S、As 三种元素比较,正确的是
A.电负性O > S > As,原子半径O < S < As
B.电负性O < S < As,原子半径O < S < As
C.电负性O < S < As,原子半径O > S > As
D.电负性O > S > As,原子半径O > S > As