— How many words are there in this story?    

— There are ______.  [ ]

A. two hundred and forty five

B. two hundreds and forty five

C. two hundred and forty-five

D. two hundreds and forty-five

下列属于细胞壁性质特化的有（）。

A.木质化

B.角质化

C.木栓化

D.脱分化