新東方新托福聽力特訓(xùn)Sleeping Stages

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Choose the stage of sleep which the statement describes. (Click 2 if necessary)
Babies spend almost half of sleep in this stage.    (    )

You can get easily awakened from sleep.    (    )
The brain produces mostly delta waves.    (    )
You are in deep sleep.    (    )
A    Stage 1.
B    Stage 2.
C    Stage 3.
D    Stage 4.
E    REM sleep.
(E,A,D,CD)