单项选择题

The writer makes it obvious that ______.

A．sleepwalkers are often awakened by dangers
B．the underlying cause of sleepwalking is more serious than sleepwalking itself
C．most sleepwalkers are deranged or insane
D．all of the above

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单项选择题Dr. Zelda Teplitz ______.

A．studied sleepwalking for at least ten years
B．concluded that sleepwalkers are partially asleep in their sensory area
C．maintained that it is a mistaken belief that sleepwalkers are immune to injury
D．A and B