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第PAGE\*MERGEFORMAT3页共NUMPAGES\*MERGEFORMAT3页 2021年12月英语四级阅读真题及答案第3套选词填空 Millionsofpeopletravelbyplaneeverysingleday.Ifyou'replanningonbeingoneofthemsoon,youmightnotbelookingforwardtothe__26__feelingairtraveloftenleavesyouwith.Besidestheairportcrowdsandstress,travellingatahighaltitudehasrealefectsonthebody.Althoughthepressureofthecabinis__27__topreventaltitudesickness,youcouldstill__28__sleepinessoraheadache.Theloweroxygenpressurefoundinanaircraftcabinis__29__tothatat6,000-8,000feetofaltitude.Adropinoxygenpressurecancauseheadachesincertain__30__Tohelppreventheadaches,drinkplentyofwater,andavoidalcoholandcoffee.Aiplanefoodmightnotreallybeastatelessasyou__31__thought.Theairyoubreatheinaplanedriesoutyourmouthandnose,whichcanaffectyoursenseoftaste.Perceptionofsweetandsaltyfoodsdroppedbyalmost30percentinasimulationofairtravel.However,youcanmakeyourtastebudsactiveagainbydrinkingwater.Adrymouthmay__32__tastesensitivity,buttasteisrestoredbydrinkingfluids.Althoughin-flightinfections__33__indryenvironmentslikeairplanes,yourriskofgettingsickfromanairplaneisactuallylowbecauseoftheair__34__used.Unlessyou'resttingnexttosomeonewhoiscoughingorsneezing,youshouldn'tworrytoomuchaboutgettingsick.However,bacteriahavebeenshowntoliveoncabinsurfaces,sowashyourhands__35__.A)adjustedB)channelsC)equivalentD)experienceE)filtersF)frequentlyG)individualsH)originallyI)particularJ)primarilyK)reduceL)renovatedM)smoothN)thriveO)unpleasant26.O27.A28.D29.C30.G31.H32.K33.N34.E35.F
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