单项选择题

A．During the stage when sounds or light affects you.
B．During the stage when your eyes move rapidly.
C．During the stage when you sleep soundly.
D．During the stage when you sleep lightly.
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单项选择题
A．In a boat.B．In a cave.C．In a river.D．In a tree.
A．In a boat.
B．In a cave.
C．In a river.
D．In a tree.
单项选择题
A．31%.B．33%.C．58%.D．24%.
A．31%.
B．33%.
C．58%.
D．24%.
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