26. Why is the question of how easily people can get used to working at night no mere academic one?
A. Because few people like to reverse the cycle of sleep and wakefulness.
B. Because sleep normally coincides with the hours of darkness.
C. Because people are required to work at night in some fields of industry.
D. Because shift work in industry requires people to change their sleeping habits.
27. The main problem of the round-the-clock working system lies in_______.
A. the inconveniences brought about to the workers by the introduction of automation
B. the disturbance of the daily cycle of workers who have to change shifts too frequently
C. the fact that people working at night are often less effective
D. the fact that it is difficult to find a number of good night workers
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______.
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