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

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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
单项选择题
If you don't have as much sleep as your body needs, you will （）

A．work properly
B．think clearly
C．keep your attention on your work
D．easily get angry
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