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2019年12月英语四级作文关系词:先后次序

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      3.C实事底细题。

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      4.A角度姿态题。

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      大学英语四级细阅练练习(17)Althoughmanyofusmayfeelair-conditionersbringrelieffromhot,humidorpollutedoutsideair,theyposemanypotentialhealthhazards.Muchresearchhaslookedathowthemovementofairinsideaclosedenvironment---suchasanofficebuilding---canspreaddiseaseorexposepeopleinthebuildingtoharmfulchemicals.OneofthemorewidelypublicizeddangersisthatofLegionnaire’sdisease,whichwasfirstrecognizedinthe1970s.Thiswasfoundtohaveaffectedpeopleinbuildingswithair-conditioningsystemsinwhichwarmairpumpedoutofthesystem’coolingtowerswassomehowsuckedbackintotheairintake(透风口),inmostcasesduetopoordesign.Thewarmair,filledwithbacteria,wascombinedwithcooled,conditionedairandwasthencirculatedaroundvariouspartsofthebuilding.Studiesshowedthatevenpeopleoutsidesuchbuildingswereatriskiftheywalkedpastairexhaustpipes.Largeair-conditioningsystemsaddwatertotheairtheycirculatebymeansofhumidifiers(湿度调剂器).Inoldersystems,thewaterusedforthisprocessiskeptinspecialreservoirs,thebottomsofwhichprovidebreedinggroundsforbacteriawhichcanfindtheirwayintotheventilation(透风)system.Therisktohumanhealthfromthissituationhasbeenhighlightedbythefactthattheimmunesystems(免疫系)ofapproximatelyhalfofworkersinair-conditionedofficebuildingshavedevelopedtheabilitytofightofftheorganismsfoundatthebottomofsystemreservoirs.Butchemicalscalledbiocidesareaddedtoreservoirstomakethemgerm-free,andtheyaredangerousintheirownrightinsufficientquantities,astheyoftencontaincompoundsstronglylinkedtocancers.Finally,itshouldbepointedoutthattheartificialclimaticenvironmentcreatedbyair-conditionerscanalsoaffectus.Inanaturalenvironment,whetherindoororoutdoor,therearesmallvariationsintemperatureandhumidity.Indeed,thehumanbodyhaslongbeenaccustomedtothesenormalchanges.Inanair-conditionedlivingorworkingenvironment,however,bodytemperaturesremainwellunder37℃,ournormaltemperature.Thisleadstoaweakenedimmunesystemandthusgreaterexposuretodiseasessuchascoldsandflu.练练习:Choosecorrectanswerstothequestion:1.WhatdoweknowaboutLegionnaire’sdiseasefromthepassage?A.Itwasthemostwidelyconcernedofficehazard.B.Itcanaffectpeoplebothinsideandoutsidethebuilding.C.Ithappensonlyinair-conditionedofficebuildings.D.Itdoesnotdevelopinwell-designedbuildings.2.Intheoldair-conditionedsystems,bacteriafirstdevelop______.A.inthereservoirsB.intheventilationsystemc.inthehumidifiersD.intheairintake3.Thefactthatabouthalfofworkersdevelopedtheabilitytofightoffthebacteriamay__.A.relievepeople’sworryaboutthedangercausedbythebacteriaB.helppeoplefindaneffectivewaytogetridofthebacteria英语四级听力真题mp3下载C.reflecttheseriousdangerbroughtbythebacteriaD.causeseriousdiseasesuchascancerstopeople4.Theauthormostprobablywantsthereaderstotreatbiocideswithanattitudeof_.A.cautionB.trustC.enthusiasmD.criticism5.Thelastparagraphimpliesthatourimmunesystemcanbeweakenedwhen_•A.weliveinanartificialclimaticenvironmentB.therearevariationsintemperatureandhumidityC.ourbodytemperaturesoftenremainnothighenoughD.weareoftenexposedtodiseasessuchascoldsandflu1.B实事底细题。