I haven't seen Sara since she was a little girl,  and she has changed beyond _____.   [ ]

A. hearing                          

B. strength  

C. recognition                      

D. measure

构成生物体的细胞多种多样，它们的形成是通过什么实现的？（　　）

A．细胞生长

B．细胞分裂

C．细胞分化

D．细胞增生