第13题: [单项选择]The best solution for implementing the 24-hour working system seems to be ______. A. to change shifts at longer intervals B. to have longer shifts C. to employ people who work on night shifts only D. to create better living conditions for night workem 参考答案:C 答案解析:第三段第一句说:惟一现实的方法似乎是把夜班时间交给永久性上夜班的工人。C项意为“雇佣那些只上夜班的工人”,故正确答案应为C项。