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
What does subjects (Line 2, Para. 3) mean in this passage
A．Any member of a state except the supreme ruler.
B．Something to be talked or written about or studied.
C．Person, animal or thing to be treated or dealt with.
D．Theme on which a composition is based.
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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