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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单项选择题
When you are sleeping, （）

A．all of you reflexes stop working
B．most of your reflexes stop working
C．many of your reflexes still work
D．all of your reflexes still work
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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