–It’s thirty years since we last met.

-But I still remember the story, believe it or not,            we got lost on a rainy night.

A．which

B．that

C．what

D．when

在骨发生过程中，可见到以下哪种改变：（）.

A.骨祖细胞不断增殖、分化

B.成骨细胞不断形成类骨质

C.骨细胞不断分裂增殖

D.破骨细胞不断溶解骨质

E.血管向骨内生长