题目

   I saw a man, about 30 years old, hobbling(蹒跚) down the road when I was shopping in town. He was homeless and seemed to have a pain (疼)in his leg. I watched him for a few minutes but wasn’t able to help that day.    All that evening, I thought about his life and story. Later, I decided that if I met him again, I would help him. I saw him in the street the very next day! I saw him put some money into a donation box(捐款箱) . Then I quickly went to the cash machine(自动取款机) to get some money. With money in my pocket, I followed him. I heard him ask a lady for monDNA在真核细胞内的存在部位可能有：A.细胞核核糖体线粒体B.叶绿体高尔基体内质网C.细胞核线粒体叶绿体D.线粒体染色体核糖体