2020-2021学年东北师大附中净月实验学校高三英语一模试题及参考答案第一部分阅读（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AYoumightnotexpectit,butcowsarealargesourceofthegreenhousegasesthataredrivingclimatechange.Cowsproducelotsofmethanebybreakingdownthegrass,Nowscientistshaveshownthatthepollutionfromcowscanbereducedbyaddingalittleseaweedtotheirfood.Scientistsfirstdiscoveredthatseaweedcouldhelpcontrolmethanefromcowsseveralyearsago.Butthisworkwasdoneinalaboratory,thereweremanyquestionsaboutwhethertheideacouldworkinreallife.Inthelabstudies,thecowsweregivenquiteabitofseaweed,andtheywouldcauselosingweight.Thatwasn'thelpful,sincecowsareoftensoldbyweight.Italsowasn'tcleariftheseaweedwouldstopworkingifitwasusedforalongerperiodoftime.Now,scientistsfromtheUniversityofCalifornia,Davishaveansweredseveralofthesequestions.Theresearchersstudied21cowsonafarmforaboutfiveTheymonths.taughtthecowstogettheirfoodfrominsideaspecialhood,whichallowedthescientiststomeasurethemethanethatthecowsweregivingoff.Thistime,theyusedamuchsmalleramountofseaweed,whichtheymixedwiththecows'food.Theresultsweresurprisinglygood.Insomecases,thecowsproduced82%lessmethane.Theimprovementdependedonthekindoffoodthecowsweregiven,buteventheworst-pollutingcowsproduced33%lessmethane.Overthefivemonths,thescientistsdidn'tseeanysignsthatthecows'stomachsweregettingusedtotheseaweedandstartingtoproducemoremethaneagain.Anothersurprisecamewhentheylookedattheweightofthecows.Thecowsthatwerefedseaweedgainedjustasmuchweightastheothercows,buttheydidn'tneedasmuchfood.Buttherearestillsomebigproblemswiththeideaoffeedingcowsseaweed.Foronething,there'snotadequateseaweedtofeedallofthecowsintheworld.Sofarmerswouldhavetofigureoutawaytogrowlotsofseaweed.Abiggerproblemisthatformostoftheirlives,cowsliveinfields,wheretheyeatthegrass.Thatmeansthere'snochancetofeedthemseaweedeveryday.Theseproblemsneedtobetakenseriouslyiftheworldisgoingtoavoidtheworsteffectsoftheclimatecrisis.Still,it'struethatsomethin