单项选择题

What is true of sleepwalking according to the passage

A．It is caused by emotional conflict or guilty conscience.
B．It is the acting out of a vivid dream.
C．Somnambulists are asleep during their sleepwalking.
D．It is dangerous to waken a sleepwalker.

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单项选择题

Many of Chile's tourists used to come from EXCEPT______

A．U.S.
B．the Far East.
C．western Europe.
D．her neighbors.

单项选择题

According to the passage, in WHICH area improvement is already under way

A．Facilities in the ski resorts.
B．Domestic transport system.
C．Air services m Asia.
D．Road network in the sout