单选题:下列生物知识不正确的一项是(  )。

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题目内容:
下列生物知识不正确的一项是(  )。 A.生物体的基本单位是细胞
B.人类主要的造血器官是脊髓
C.人体共有600多块肌肉,206块骨头
D.紫外线能够杀菌的主要原因是紫外线能够破坏细菌的核酸
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