题目

根据短文内容，选择最佳答案。Do you remember the first word that you spoke? If you can, you are unusual. Suppose what your life was like during the first few months. I'm sure that it took your most time to eat，sleep and cry. As you grew older you slept less. Your parents would spend more time playing with you and talking to you. You watched and listened. You got to know that people make some sounds to go with some things.Then you began to cry and to make sounds you heard. And little by little you could make right sound for one thing.Then you got to understand the secret of the l下列示意图分别表示某雌性动物(2N=4)体内细胞正常分裂过程中，不同时期细胞内染色体、染色单体和DNA含量的关系以及细胞分裂图像。请分析并回答 (1)图B甲细胞中有___________条染色单体，有___________个DNA分子，处于____________期。(2)图A中a～c柱表示染色体的是__________。(3)图A中的数量关系由Ⅰ变化为Ⅱ的过程，细胞内发生的主要变化是______________；由Ⅱ变化为Ⅲ，相当于图B中的_______→_______过程。(4)符合图A中Ⅳ所示数量关系的某细胞名称是__________________。