TPO12听力疑问

stleger

TPO12听力 第一个lecture讲 细胞分裂的 第一题为什么选D呢？怎么看怎么不应该选D啊  有知情的人 解答下吗
what does the professor mainly discuss
A how genes control human development
B why various types of human cells divede at different rates
C How human chromosomes differ from one another
D Why most human cells cannot keep dividing successfuly