任务型阅读。
阅读下面短文, 根据所读内容在表格中的空白处填入恰当的单词.
注意:每个空格只填一个单词.
People who enjoy a dreamfilled sleep are better at recalling information and links between
facts when waking. But recharging with a shallow (小睡) offers no such mental improvement, the
research suggests. The results of the study added to the growing body of evidence that Rapid Eye
Movement (REM) sleep is very important to the brain's ability to form strong memories.
An average night's rest includes four or five spells of REM sleep, but these bursts tend to be lengthier
towards the end of the night. This means s getting less than the recommended seven to eight hours
a night - and therefore inadequate REM sleep - may be damaging their mind's ability to memorize:
Although REM sleep is not classified as a type of deep sleep, it is only reached after the brain has passed
through deep sleep stages.
In the recent study, participants were shown groups of three words and asked to find another word
that can be associated with all three words. They were tested once in the morning and then given the
same task again in the afternoon. In between, some were allowed a nap with REM sleep, some a nap
without REM sleep, while the others had a quiet rest period. The quiet rest and nonREM sleep groups
didn't improve, but the REM sleep group improved on their morning performance by an average of
almost 40 per cent. Dr Sara Mednick, a sleep researcher at the University of California who led the
study, believes the formation of connections between previous unassociated information in the brain
occurs during REM sleep.
It is believed that sleep acts as a sort of mental filing system, enabling the brain to sort relevant
information from useless information. This process may take place as memories are removed from one
part of the brain to others.

TitleREMSleep1.________Memory
TheresultofthestudyRapidEyeMovementsleepisofgreatimportancetothebrain'sabilityto
2．.________memories.
The3.________ofthestudy4.________ were required to think of another word associated with all three words.
The same task was given to participants 5.________ a day.
The quiet rest and nonREM sleep groups showed no 6.________.
The REM sleep group 7.________ well by an average of almost 40 per cent.
DrSaraMednick's8.________Connections between previous unassociated information in the brain are
9.________ during REM sleep.
ConclusionSleep acts as a sort of mental filing system, enabling the brain to abandon useless information and keep the 10. ________ information.