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1英语(◇)答案)
the oxygen levels again.The newmeasurements also showed rising oxygen levels.That's when herealizedsomethingunusual was happening.Somehow,oxygenwasbeing created on the dark ocean floor.Many companiesinvarious countries areinterested inmining thesea bottominthe Clarion-ClippertonZoneThis area is rich in small,rock-like objects filled withvaluable metals called“polymetallic nodules(多金属结核)”,whichformnaturallyontheoceanfloorovermillionsofyears.Dr.Sweetmansuspectedthatthesenodulesmightberesponsibleforthe"darkoxygen”heobservedTounderstand howthe oxygenwasbeing created,Dr.Sweetman collected samplesof thenodules and took themback tothe laboratoryfor study.At first,scientists thought tiny organisms calledmicrobes（微生物）might beproducingtheoxygen.ThentheyconsideredthepossibilitythatthenodulesthemselveswerereleasingoxygenHowever,neitherideawascorrect.Finally,Dr.Sweetmanwonderedifthenoduleswereactinglikebatteries andproducingelectricity.Thisideamadesensebecausewhenelectricitypassesthroughsaltwater,It breaksdown thewaterintohydrogenandoxygen.Withhelpfromotherscientists,Dr.Sweetmanfoundthatthenodulesdomakeasmall amount of electricity.When thenodules arecloseto each other,theymake enough electricitytoproduce theoxygenhesaw.Scientists believe that these nodules play animportant roleinthe deep-sea ecosystem.They areconcernedthatdeep-seaminingcoulddestroythenodulesandtheenvironmentaroundthem.Therefore,Weneedtothinkcarefullybeforestartingminingactivities12.According to the passage,what did Dr.Sweetman find when he measured the oxygen levels in 2013?A.Oxygen levels were zero.B.Oxygenlevelswere stableC.Oxygen levels were increasing.D.Oxygen levels were decreasing.13.WhydidDr.Sweetmaninitiallythinkhisequipmentwasn'tworking?A.Heexpectedoxygenlevelstorise.B.He expected oxygen levels to drop.C.He expected the equipment to fail.D.He expected no change in oxygen levels.14.What canwe knowfrom the paragraph5?A.Nodules might improve water quality quickly.B.NodulescouldenhancethegrowthofmicrobesC.Nodules may increase themarine biodiversity.D.Nodules could produce electricity and oxygen.15.Which of thefollowingwould be the best titlefor thepassage?A.Discovering Dark Oxygen Sources.B.Deep-SeaMining andItsImpactC.The Importance of Photosynthesis.D.TheRole of Microbes in Oxygen试卷第7页，共11页
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