Theoceanbottomaregionnearly2．5timesgreaterthanthetotallandareaoftheEarthiseventodaylargelyunexplored．Untilaboutacenturyagothedeep-oceanfloorwascompletelyinaccessibleandhiddenbeneathwatersaveragingo|小学英语问答-字典翻译问答网

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Theoceanbottomaregionnearly2．5timesgreaterthanthetotallandareaoftheEarthiseventodaylargelyunexplored．Untilaboutacenturyagothedeep-oceanfloorwascompletelyinaccessibleandhiddenbeneathwatersaveragingover3600metersdeep．TotallywithoutlightandsubjectedtointensepressureshundredsoftimesgreaterthanattheEarth’ssurfacethedeep-oceanbottomisastrangeenvironmenttohumansinsomewaysasforbiddingandremoteastheouterspace．

Althoughresearchershavetakensamplesofdeep-oceanrocksforoveracenturythefirstdetailedglobalstudyoftheoceanbottomdidnotactuallystartuntil1969withthebeginningoftheNationalScienceFoundation’sDeepSeaDrillingProject(DSDP)．UsingtechniquesfirstdevelopedfortheoffshoreoilandgasindustrytheDSDP’sdrillshiptheGlomarChallengerwasabletomaintainasteadypositionontheocean’ssurfaceanddrillinverydeepwaterstakingsamplesof rockfromtheoceanfloor．

TheGlomarChallengercompleted96voyagesina15-yearresearchprogramthatendedinNovember1983．Duringthistimeitsailed600000kilometersandtookalmost20000samplesofrocksaroundtheworld．ThosesampleshaveallowedgeologiststoreconstructwhattheplanetlookedlikehundredsofmillionsofyearsagoandtomakeoutwhatitwillprobablylooklikemillionsofyearsinthefutureTodaylargelyonthestrengthofevidencegatheredduringtheGlomarChallenger’svoyagesnearlyallearthscientistsagreeonthetheoriesofplatetectonics（构造学）andcontinentaldriftthatexplainmanyofthegeologicalprocesses．

ThesamplesofrocksdrilledbytheGlomarChallengerhavealsoprovidedaclimaticrecordstretchingbackhundredsofmillionsofyears．Theinformationofpastclimaticchangecanbeusedtopredictfutureclimates．

68．Whatdoestheunderlinedword“inaccessible”inline3means?

A．unrecognizable B．unreachable C．unusable D．unreasonable

69．Whydoestheauthormention“outerspace”inthefirstparagraph?

A．TheEarth’sclimatemillionsofyearsagowassimilartothatinouterspace．

B．Itissimilartotheoceanfloorinbeingstrangetothehumans．

C．Rockformationsinouterspacearesimilartothosefoundontheocean

陈念贻回答：

　　小题1:B小题2:B小题3:D小题4:C

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