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当前学科：肿瘤与饮食营养
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维生素C缺乏与多种肿瘤的高发生率相关，维生素C缺乏可降低免疫能力，还有利于合成下列哪种物质（）。
A . 二哑英
B . 亚硝胺
C . 苯并A.芘
D . 杂环胺
E . 多环芳烃类化合物
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