对根的伸长区的叙述，错误的是 [ ]

A．伸长区的细胞大小不等

B．伸长区的细胞来自于分生区

C．伸长区的细胞不断长大，成为成熟区的细胞

D．伸长区的细胞不断分裂，增加根细胞的数量

What does the woman mean
[A] Dr. Wang is as busy today as yesterday.
[B] Dr. Wang is not so busy today as yesterday.
[C] Dr. Wang is busier today than yesterday.