[填空题]

Part B Directions: You are going to read a list of headings and a text about human daily cycle of activity. Choose the most suitable heading from the list A - F for each numbered paragraph (41 -45 ). The first and last paragraphs of the text are not numbered. There is one extra heading which you do not need to use. Mark your answers on ANSWER SHEET 1. (10 points)
41. We all know that normal human daily cycle of activity is of some 7-8 hours’ sleep alternating with some 16-17 hours’ wakeful ness and that, broadly speaking, the sleep normally coincides with the hours of darkness. Our present concern is with how easily and to what extent this normality can be modified.
42. The question is no more an academic one. The case, for example, with which people can change from working in the day to working at night is a question of growing importance in industry where automation calls insistently for round - the - clock working. of machine. It norma

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