题目内容

以下推断正确的一项是()。

A. 人们对于细胞的研究已经很全面彻底
B. 人们已经利用胚胎干细胞治疗人类疾病
C. 人们能够利用造血干细胞治疗血液病
D. 干细胞不是所有分化细胞的始祖

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