单项选择题

Why must nurses work in shifts

A．They are careless.
B．Nursing services must be provide continuously.
C．They work at night from time to time.
D．A shift is usually eight hours long.
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单项选择题
The topic of the 4th paragraph is that ______.
A．one problem of loneliness is a person's social contacts
B．we depend on various people for different reasons
C．lonely people don’t have many social problems
D．lonely people don’t have many friends
单项选择题
Why don’t nurses study for as many years as doctors
A．Most nurses work long days.
B．They don't treat patients for illness and injury.
C．Caring for sick persons requires patience and concern.
D．They are not dedicated.
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