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 andB.

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单项选择题

Throughout the passage, the writer’s tone towards the DNB was ______.

A．complimentary.
B．supportive.
C．sarcastic.
D．bitter.

单项选择题

The writer suggests that there is no sense in buying the latest volume ______.

A．because it is not worth the price.
B．because it has fewer entries than before.
C．unless one has all the volumes in his collection.
D．unless an expanded DNB will come out shortly.