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

Who was supposed to be the world’s champion sleepwalker

A．The man walked sixteen miles along a dangerous road.
B．The boy walked five hours in his sleep.
C．The student habitually walked to the Iowa River and swam in his sleep.
D．The man danced a minuet in his sleep.

单项选择题

What does the phrase taken with a barrel of salt mean at end of the second paragraph

A．inconceivable
B．unbelievable
C．suspected
D．implausible