单项选择题

This passage is mainly about ______.

A．how to have a sound sleep
B．what causes loss of sensations
C．what will happen if sensations were lost
D．how to lose sensations
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单项选择题
It can be concluded that after sensory deprivation ______.
A．all the subjects fell asleep and slept for a long time
B．some subjects didn't spent much time on sleeping
C．it took a long time for the subjects to adapt themselves to sensory deprivation
D．many subjects became credulous
单项选择题
Which of the following can be inferred from the passage
A．All the people react in the same way to sensory deprivation.
B．The researchers expected the subjects to sleep for a long time.
C．The first reaction to sensory deprivation is to shout loudly.
D．Total sensory deprivation means that the brain has no real information to work on.
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