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1、Unit4GlobalwarmingⅠ.阅读理解ANaturehasitsownwayofbalancingitselfout,butwhenwehumansgetinvolved,wetendtothrowthingsoutofcontrol.Forestsandoceansarenaturalcarbonsinksthatabsorbcarbondioxidefromtheatmosphere,butsincewe?vebeenpumpingtoomuchintotheair,thosesinkscan?tkeepup.ScientistsattheMaxPla
2、nckInstituteinGermany,ledbybiologistTobiasErb,havefiguredoutawaytosuperchargeplantstomakethembetteratabsorbingCO2,whichcouldbeakeydefenseagainstclimatechange.Erbandhisteamfiguredoutawaytomakeplantsmoreefficientatabsorbingcarbon,sothattheyconsumedmorecarboninashorteramountoftime.“Ifyout
3、hinkaboutplants,theyareefficientCO2-fixingfilters,buttheyarenotfast,”Erbsaid.“Ithinkthereisachancetoimproveexistingbiologywithsynthetic(人造的)biology.”Erb?steamidentified17enzymes(酶)fromninedifferentorganisms,re-engineeringthreeofthem,thathadanenlargedcarbonconsumption.Whenthoseenzymeswo
4、rkedtogetherasateam,theyworkedbetteratnotonlyplants?naturalenzymes,butalsothemselvesindividually.Existingenzymesinplantsconsumeabout5to10molesofCO2persecond.TheteamofenzymesthatErbusedconsumed80molespersecond.Sofar,theseenzymeshaveonlybeentestedintesttubesinthelab,butthenextstepisrealw
5、orldtestingwheretheenzymeswouldbeintroducedintoplantstoseeifthesameresultoccurs.Ifthosetestsshowthatplantsreallycanbesupercharged,wecouldhaveanewtoolinthefightagainstclimatechangewherenotonlydoweprotecttheamazingcarbon-absorbingforestswehave,butwealsoaddthesesuperplantsoranartificialle
6、aftechnologyusingtheenzymesintoothermixedfields.1.Whycan?tforestsandoceansbalancenature?A.Becauseoceansandforestsaregettingsmaller.B.BecausewehumanbeingsgiveofftoomuchCO2.C.Becausealargenumberofforestsarecutdown.D.Becausetherearetoomanycreaturesintheworld.2.Whichisthekeydefenseagainstc
7、limatechangeaccordingtoErbandhisteam?A.Toincreasetheplants?abilityandefficiencytoabsorbCO2.B.TomakeoceansandforeststoabsorbmoreCO2quickly.C.ToreducethehumanactivitiesgivingofftoomuchCO2.D.Toincreasethenumberofplantsintheworld.3.Whatcanwegetfromthelastparagraph?A.Theenzymeshaveprovedu
