1. The question raised in Paragraph 1 is "no mere academic one"
A)because Bonjer's findings are different from Browns.
B)because sleep normally coincides with the hours of darkness.
C)because some people can change their sleeping habits easily.
D)because shift work in industry requires people to change the sleeping habits.
2. According to the passage, the main problem about night work is that
A) people hate the inconvenience of working on night shifts.
B) your life is disturbed by changing from day to night routines and back.
C) not all industries work at the same hours.
D) it is difficult to find a corps of good night workers.
3. According to the passage, the best solution on the problem seems to be
A) not to change shifts from one week to the next.
B) to make periods on each shift longer.
C) to employ people who will always work at night.
D) to find ways of selecting people who adapt quickly.
4. In the second paragraph, "the third" means
A) the third week
B) the third shift
C) a third of the time
D) the third routine
5. In the last sentence of the second paragraph, "another" means
A) another routine
B) another shift
C) another week
D) another person
key: DBCBA