第34题: [单项选择]Which of these is not a possible factor leading to greater productivity A. To make jobs more varied. B. To give the worker freedom to do his job in his own way. C. Degree of work contribution. D. Demands for longer working hours. 参考答案:D 答案解析:[解析] 文章分别讨论了几种可能会提高生产力的方法,但未提到D项。