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【单选题】
进入机体后不需体内代谢活化，其原型就可与遗传物质（主要是DNA）作用而诱导细胞癌变的物质属于哪种致癌物？A.
直接致癌物
B.
间接致癌物
C.
无机致癌物
D.
有机致癌物
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A.
corporations hardly introduce ever
B.
corporations hardly ever introduce
C.
hardly corporations introduce ever
D.
hardly corporations ever introduce
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