题目

Mr. Smith worked in a post office and three years ago, when he was sixty, he retired. So he has a lot of free time now. He likes neither reading nor watching TV. He feels bored and he goes to visit his old friend Mr. Hunt. Mr. Hunt is two years                                                                                                                                        older than him. He asks Mr. Smith to go fishing with him .           �下列关于细胞与生命活动关系的叙述错误的是(　　) A．草履虫的生命活动离不开细胞 B．病毒的生命活动可以离开细胞 C．细胞内的生物大分子没有生命 D．多细胞生物的一个细胞不能完成各种生命活动