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【单选题】
下列有关细胞衰老、凋亡和癌变的叙述中，错误的是（）
A.
衰老细胞的膜通透性改变，呼吸速率减慢
B.
衰老的生物体中，细胞都处于衰老状态
C.
细胞凋亡是由细胞内的基因决定的
D.
人体细胞中都有与癌变有关的基因
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