单项选择题

Sleep helps your body to relax to such an extent （）

A．that any rest can reach
B．that no rest can have the same effect
C．that you will never need any rest
D．that you will need the most quiet rest

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单项选择题
In the clause .., that we are unconscious in sleep, the word unconscious means （）

A．untiring
B．unmoved
C．guiet
D．not knowing what is happening around
单项选择题
The cells of your body develop supplies of energy（）

A．when you are asleep
B．when you recover from your work of the day
C．in the next period of activity
D．when you are quiet
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