1.What is the writer's main aim in writing the text?
A. To describe the importance of work.
B. To help people change their way of life.
C. To say how working at night can be harmful. D. To suggest how to become a night shift worker
2.What does the wrier say about night jobs?
A.You get better working conditions.
B.There is a variety of them
C.It is easier than working during the day.
D.Many people refuse to work at night .
3.What would a reader learn about sleep from the text?
A.Everybody needs the same amount.
B.It's difficult to change you sleeping needs
C.People sleep batter in the early morning
D.It's easy to change your sleeping habits.
