答案：A

　　B

　　Scientists found that sleeping considerably improves our creativity.After taking a nap people are able to think faster and

　　put more imagination into their thinking.Besides，if we dream，the thinking abilities are improved even more.

　　Researchers consider that sleeping on a problem in most cases leads to elucidation (解释).They say when a person enters a phase called Rapid Eye Movement (REM) during sleep，it increases the effect.Such phase takes place right before we awake and according to scientists it helps our brain make links between unrelated subjects.

　　In the study，led by Professor Sara Mednick，scientists made a conclusion that the REM was “important for assimilating (消化) new information into past experience” in order to find solutions to creative problems.

　　Prof.Mednick is a psychiatrist at the University of California.Her study involved the analysis of 77 adults.Each participant was given several word­associated creative tasks.All tasks were given in the morning，with participants being shown a number of groups of 3 words，for example：cookie，heart and sixteen.They were asked to come up with a word that would be associated all three given terms－like sweet.Sometime later，after some participants were allowed to sleep，they were asked to perform the same tasks and some new ones.It is worth mentioning that while some people slept，researchers used brain scans to see the type of sleep each participant entered.

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