2014届高考英语一轮复习 unit19 指导课时作业b卷（含解析） 北师大版

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1、Unit19B卷一、阅读理解ATheclimatesecretsofthedeepestpartoftheocean，theMarianasTrench(壕沟)inthewesternPacificOcean，havebeenexploredbyscientists.Theinternationalteamusedasubmersible，designedtowithstandgreatpressure，tostudythebottomofthe10.9kmdeepunderwatercanyon.Theirearlyresultsreveal

2、thatoceantrenchesareactingascarbonsinks.ThissuggeststhattheyplayalargerroleinregulatingtheEarth’schemistryandclimatethanwasthought.Althoughtwoexplorers，JacquesPiccardandDonWalsh，reachedthedeepestpartoftheMarianasTrench—apointcalledtheChallengerDeep—in1960，nohumanshavebeenbac

3、ksince.Andthescientificmissions，includingthisrecentvisittothisdeepestspot，havebeencarriedoutusingunmannedunderwatervehicles.LeadresearcherProfessorRonnieGlud，fromtheUniversityofSouthernDenmarkandtheScottishAssociationforMarineScience，saidthatworkingatmorethan1,000atmospheres

4、ofpressurewaschallenging，butadvancesintechnologyhadmadeitpossible.HetoldBBCNews，“Thisisthefirsttimewehavebeenabletosetdownsophisticated(精密的)instrumentsatthesedepthstomeasurehowmuchcarbonisburiedthere.”Thetestsalsohelpedthescientiststoassessthestorageofcarbonatthosedarkdepths

5、.Thisisnotthefirsttimedeepseatrencheshavesurprisedscientists.RecentstudiesbyUniversityofAberdeen’sOceanlabteamhaverevealedthatmarinelifeismuchmoreabundantinthisdifficulthabitatthanwaspreviouslythought.In2008，theyfilmedthedeepestlivingfishevertobecaughtoncamera—a17strongshoal

6、(鱼群)foundatdepthsof7.7kmintheJapanTrench，andtheydiscoveredthatotheranimalssuchasamphipodswerepresentinlargenumbersevendeeper.DrAlanJamieson，fromOceanlab，saidthenewstudywashelpingresearcherstobuildupabetterideaofwhathappensinthedeepestofthedeep.1．Fromthedescriptionofcarbonsin

7、kswelearnthat______.A．theyhavebeenontheoceanfloorforthousandsofyearsB．thetrenchescanbeusedtocontrolclimateC．therearemanychemistryresourcesontheoceanfloor6D．thecarbonsinkscontributetochangesintheclimate2．Whatcanbeinferredfromthepassage?A．ManyscientistshavediedintheMarianasTre

8、nchduringexplorations.B．JacquesPiccardandDonWalshcamebacksuccessfullyfromth