2011年英语四级阅读备考材料（28）_第2页

　　28. 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 workers

　　29. It is possible to find out if a person has adapted to the changes of routine by measuring his body temperature because______.

　　A. body temperature changes when the cycle of sleep and wakefulness alternates

　　B. body temperature changes when he changes to night shift or back

　　C. the temperature reverses when the routine is changed

　　D. people have higher temperatures when they are working efficiently

　　30. Which of the following statements is NOT TRUE?

　　A. Body temperature may serve as an indication of a worker's performance.

　　B. The selection of a number of permanent night shift workers has proved to be the best solution to problems of the round-the-clock working system.,

　　C. Taking body temperature at regular intervals can show how a person adapts to the changes of routine.

　　D. Disturbed sleep occurs less frequently among those on permanent night or day shifts.

　　26. D 27. B 28. C 29. D 30. B