题目

He was a professor. At the age of 90, he still worked eight hours every day regardless  61   the weather. His secretary said: “He was extremely old, but he forced himself to walk from his living place to the office through two blocks.  62  would take him an hour to do so, but he insisted because it made him get a sense of    63  (succeed).” One day, a university student  64  (step) out of his office with a pile of books. He complained: “He always answers my questions with just a yes or no. However, he always gives me dozens of books and suggests me  65  (find) the an4．下列关于细胞与生命活动关系的描述错误的是（　　）A．一切生物的生命活动都在细胞内或细胞参与下完成B．缩手反射和膝跳反射的完成均需要多种分化的细胞密切合作C．引起非典型性肺炎和甲型H1N1流感的病原体均无细胞结构，其生命活动与细胞无关D．变形虫、草履虫等单细胞生物，只靠一个细胞就可以完成摄食、运动、分裂等多种生命活动