题目

完形填空。阅读下面短文，掌握大意，然后从A、B、C、D四个选项中选出一个最佳选项One day a small boy was walking along the street in London. His name was Tom. It was a cold winter day in 1900.   1   he could have no breakfast   2  lunch. He wanted to buy bread，but he didn’t   3   any money.  His father   4   when he was very young. His mother was often very ill（生病的）, so she could not   5   Tom and his brother, Mike. They had to work   6   their sick (生病的) mother.He was small  7  his dream was very big. His wish was  下列关于细胞结构和功能的叙述，错误的是（     ）      A．生物膜相互转化的基础是膜的组成和结构的相似性      B．内质网与细胞新陈代谢有密切的关联，因此细胞代谢越旺盛，细胞的内质网就越多      C．细菌和酵母菌都有细胞膜、核糖体、DNA、RNA      D．细胞核即贮存遗传信息，也能对细胞的新陈代谢有调控作用