根冠的外层细胞不断磨损,但根冠从不会因磨损而消失,原因是( )
A:分生区细胞能分裂分化补充
B:伸长区细胞能伸长生长
C:根冠内层细胞特别耐磨
D:根能长出根毛
— Let's play table tennis after work, shall we?
— ________ I can't wait to do that.