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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.