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1、【优化指导】（课标全国）高考英语总复习课时作业38北师大版课时作业（三十八）Unit19B卷一、阅读理解ATheclimatesecretsofthedeepestpartoftheocean,theMarianasTrench（壕沟）inthewesternPacificOcean,havebeenexploredbyscientists.Theinternationalteamusedasubmersible,designedtowithstandgreatpressure,tostudythebottomofthe10.9km-deepun
2、derwatercanyon.Theirearlyresultsrevealthatoceantrenchesareactingascarbonsinks.ThissuggeststhattheyplayalargerroleinregulatingtheEarth'schemistryandclimatethanwasthought.Althoughtwoexplorers,JacquesPiccardandDonWalsh,reachedthedeepestpartoftheMarianasTrench—apointcal1edtheChai
3、lengerDeep一in1960,nohumanshavebeenbacksince.Andthescientificmissions,includingthisrecentvisittothisdeepestspot,havebeencarriedoutusingunmannedunderwatervehicles-LeadresearcherProfessorRonnieGlud,fromtheUniversityofSouthernDenmarkandtheScottishAssociationforMarincScience,saidt
4、hatworkingatmorethan1,000atmospheresofpressurewaschallenging,butadvancesintechnologyhadmadeitpossible・HetoldBBCNews,“Thisisthefirsttimewehavebeenabletosetdownsophisticated（榕密的）instrumentsatthesedepthstomeasurehowmuchcarbonisburiedthere.”Thetestsalsohelpedthescientiststoassess
5、thestorageofcarbonatthosedarkdepths.Thisisnotthefirsttimedeepseatrencheshavesurprisedscientists.RecentstudiesbyUniversityofAberdeen，sOccanlabteamhaverevealedthatmarinelifeismuchmoreabundantinthisdifficulthabitatthanwaspreviouslythought.In2008,theyfilmedthedeepestlivingfisheve
6、rtobecaughtoncamera—a17-strongshoal（鱼郡）foundatdepthsof7.7kmintheJapanTrench，andtheydiscoveredthatotheranimalssuchasamphipodswerepresentinlargenumbersevendeeper.DrAlanJamieson,fromOceanlab,saidthenewstudywashelpingresearcherstobuildupabetterideaofwhathappensinthedeepestofthede
7、ep・1.Fromthedescriptionofcarbonsinkswelearnthat.A.theyhavebeenontheoceanfloorforthousandsofyearsB.thetrenchescanbeusedtocontrolclimateA.therearemanychemistryresourcesontheoceanfloorB.thecarbonsinkscontributetochangesintheclimate1.Whatcanbeinferredfromthepassage?A.Manyscientis
8、tshavediedintheMarianasTrenchduringexplorations・B.JacquesPiccardandD
