A. to change shifts at longer intervals B. to have longer shifts C. to arrange for some people to work on night shifts only D. to create better living conditions for night workers 参考答案:C 答案解析:细节理解题。第三段第一句说,“要真正解决这个问题似乎只有把夜班活交给一批固定干夜班的工人去干”。第四段第一句又说,“这种专职干夜班的方法看来不失为最佳的长远之计”,故C项是正确的。