单项选择题

A．Four or five days.
B．Exactly two weeks.
C．About two weeks.
D．A few weeks.
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单项选择题
A．Man’s emotions is affected by dreams and sleep.B．A sound sleep usually brings about a good mood.C．Scientists began to do researches on dreams 20 years ago.D．What happens in a dream is less significant than who appears.
A．Man’s emotions is affected by dreams and sleep.
B．A sound sleep usually brings about a good mood.
C．Scientists began to do researches on dreams 20 years ago.
D．What happens in a dream is less significant than who appears.
单项选择题
A．Sleep and dreams.B．Moods of people.C．Effect of dreams.D．How to manipulate sleep.
A．Sleep and dreams.
B．Moods of people.
C．Effect of dreams.
D．How to manipulate sleep.
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