题目

Today, we know that the role of vitamins and minerals goes way beyond the prevention of deficiency diseases (维生素缺乏症) to actually preventing cancer and heart disease, the most fearsome killers of our time. With this knowledge has come the widespread call for nutritional supplementation (营养补充) — and a confusing group of vitamin, mineral, and supplements lining the supermarket shelves. Far from contributing to better health, however, nutritional supplements threaten to turn a scientific breakthrough into a nutritional disaster.  Promoters of vitamins and minerals 菠菜根的分生区细胞不断分裂使根向远处生长，在分裂过程中不会出现的是（　 ） A.细胞分裂间期，中心体的两个中心粒各自产生一个新的中心粒 B.细胞分裂中期，染色体形态较固定.数目较清晰 C.细胞分裂前期，核膜和核仁逐渐消失 D.细胞分裂末期，高尔基体参与细胞壁的形成