2021届南昌民德学校高三英语期末试题及答案解析.pdfVIP

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第一部分阅读（共两节，满分40分）

第一节（共15小题；每小题2分，满分30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项

Olderadultswhosleepsixhoursorfeweranightmayhaveelevatedriskfordementia(痴呆症)andother

cognitive(认知的)issues,anewstudyfinds.

ResearchersatStanfordUniversitymeasuredseniors(ages65to85)dementiariskandcognitiveabilities,

findinghigherriskinthosepatientswhoregularlysleptsixorfewerhourscomparedtothosewhosleptsevenor

eighthours.Thoseseniorswhosleptnineormorehoursalsohadlowercognitivefunctionsandotherhealth

issues,buttheresearchersdidntfindthesamehighdementiariskinthisgroup.

Thefindingsdemonstratehowimportantitisforadultstomaintainahealthysleepcycle,especiallyasthey

getolder.

Asadultsage,itscommonfortheirsleeppatternstochangeorbecomedisrupted—leadingtolonger,shorter,

ormoreirregularsleep.ThisdisruptionmaybelinkedtoAlzheimersandotherformsofdementia,impacting

seniorsabilitytorememberinformation,problem-solve,andgothrougheverydaybehaviors.Sleepdisruptioncan

alsobecausedbyorheightendepression,cardiovasculardisease（冠心病）,andotherconditions.

Arecommendedsleeptimeforseniorsisseventoeighthours,theresearcherssaid.Sixorfewerhours

correspondedtoshortsleep,whilenineormorehourscorrespondedtolongsleep.

TheStanfordresearchersmeasuredlevelsofbetaamyloid,aproteininthebrainthatistypicallyfoundinhigh

levelswhenapatientdevelopsAlzheimers.Inaddition,theresearchersusedseveraltestsformemory,attention,

spatialskills,andexecutivefunctiontoidentifypatientscognitiveabilities.Thosepatientssleepingforsixhoursor

feweranightweremorelikelytodevelopdementia,theresearcher