研究发现,在体外一定条件下培养造血干细胞,可以形成神经细胞.下列相关叙述中,不正确的是( )
A:造血干细胞仅通过有丝分裂形成三种血细胞
B:造血干细胞在体外形成神经细胞是基因选择性表达的结果
C:神经细胞的形成除受基因的控制外,还受到细胞所处外界环境的影响
D:造血干细胞有细胞周期,而神经细胞不具有细胞周期
完形填空。 Hi! I am a Chinese boy. I'm from Shanghai. 1 name is Li Qiang. I’m thirteen years old. I'm in Yucai Middle School in Shanghai. I 2 a round face, a big nose, a small mouth 3 eyes. Michael is a new student 4 our school. He 5 the U.S.A. He is tall and he 6short black hair. He 7 cool. He is thirteen years old, too. He and 8 are in the same school but in different 9. My English is not good, and he often10 me. We are good friends now.