题目

An old farmer lived on a farm in the mountains with his young grandson. Each morning Grandpa got up early to read books. His grandson tried to do everything he could to imitate(模仿) his grandfather.One day the grandson asked, “Grandpa! I try to read books just like you, but I don’t understand it, and I forget what I do understand as soon as I close the books. What good does reading do?” The grandfather quietly turned from putting coal in the stove and answered, “Take this coal basket down to the river and bring me back a basket of water.”The boy did as he was told, but all the wat3．下列有关细胞的叙述，不正确的是（　　）A．原核细胞的DNA与周围的核糖体直接接触B．纺锤体的缺失将不影响分裂期着丝粒的分裂C．龙胆紫进入细胞使染色体着色体现了膜的选择透性D．高等动物的受精卵第二次分裂所形成的4个细胞仍可能发育成4个完整的个体