单项选择题

Dr. Kleitman ______.

A．has lost so much sleep that he is now suffering from insomnia
B．has conducted experiments on sleepwalkers
C．has slept more than any other living man of his age
D．does not believe that there are any sleepwalkers at all

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单项选择题According to experts on sleepwalking, sleepwalkers ______.

A．can commit murder or other dangerous things
B．can be fatally hurt if they are wakened abruptly
C．are partially awake
D．are immune to injury

单项选择题What does the phrase taken with a barrel of salt mean at the end of the second paragraph

A．"Suspected".
B．"Justifiable".
C．"Inconsistent".
D．"Ignored".