【单选题】【消耗次数：1】
何首乌延缓细胞衰老作用最主要的是
①
降低脑内MAO－B活性
②
提高脑组织DA含量
③
提高脑组织5-HT含量
④
提高脑组织NE含量
⑤
延长果蝇寿命
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延长老年鹌鹑半数死亡时间
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降低脑组织LPO含量
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