2023年大学英语四级阅读练习及答案整理.pdf

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2023年大学英语四级阅读练习及答案整理

高校英语四级阅读练习及答案

Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,

humidorpollutedoutsideair,theyposemanypotentialhealthhazards.

Muchresearchhaslookedathowthemovementofairinsideaclosed

environmentsuchasanofficebuildingcanspreaddiseaseorexpose

peopleinthebuildingtoharmfulchemicals.

OneofthemorewidelypublicizeddangersisthatofLegionnaire’s

disease,whichwasfirstrecognizedinthe1970s.Thiswasfoundtohave

affectedpeopleinbuildingswithair-conditioningsystemsinwhich

warmairpumpedoutofthesystem’coolingtowerswassomehowsucked

backintotheairintake(通风口),inmostcasesduetopoordesign.The

warmair,filledwithbacteria,wascombinedwithcooled,conditionedair

andwasthencirculatedaroundvariouspartsofthebuilding.Studies

showedthatevenpeopleoutsidesuchbuildingswereatriskifthey

walkedpastairexhaustpipes.

Largeair-conditioningsystemsaddwatertotheairtheycirculateby

meansofhumidifiers(湿度调整器).Inoldersystems,thewaterusedfor

thisprocessiskeptinspecialreservoirs,thebottomsofwhich

providebreedinggroundsforbacteriawhichcanfindtheirwayintothe

ventilation(通风)system.Therisktohumanhealthfromthissituationhas

beenhighlightedbythefactthattheimmunesystems(免疫系统)of

approximatelyhalfofworkersinair-conditionedofficebuildingshave

developedtheabilitytofightofftheorganismsfoundatthebottomof

systemreservoirs.Butchemicalscalled“biocides”areaddedtoreservoirs

tomakethemgerm-free,andtheyaredangerousintheirownrightin

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千里之行，始于足下。

sufficientquantities,astheyoftencontaincompoundsstronglylinkedto

cancers.

Finally,itshouldbepointedoutthattheartificialclimatic

environmentcreatedbyair-conditionerscanalsoaffectus.Inanatural

environme