题目

把鼠的肝细胞磨碎后高速离心，细胞匀浆分成a、b、c、d四层．往c层加入葡萄糖，没有CO2和ATP产生，再加入丙酮酸后，马上就有CO2和ATP产生，则c层必定含有（）①线粒体②核糖体③细胞溶胶④ADP．      A．①和③               B． ②和④               C．   ①和④          D． ②和③ As soon as he ________ the bus, the poor man realized he had left his wallet on it. A) got on              B) got off                     C) got to               D) got in