all too often , a choice that seems sustainable（可持续的）turns out 阅读答案

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1、Alltoooften,achoicethatseemssustainable（可持续的）turnsout阅读答案　　Alltoooften,achoicethatseemssustainable（可持续的）turnsoutoncloserexaminationtobeproblematic.Probablythebestexampleistherushtoproduceethanol（乙醇）forfuelfromcorn.Cornisarenewableresource—youcanharvestitandgrowmore

2、,almostlimitlessly.Soreplacinggaswithcornethanolseemslikeagreatidea.　　Onemightgetabitmoreenergyoutoftheethanolthanthatusedtomakeit,whichcouldstillmakeethanolmoresustainablethangasgenerally,butthat’snottheendoftheproblem.Usingcorntomakeethanolmeanslesscornislefttofe

3、edanimalsandpeople,whichdrivesupthecostoffood.Thatresultleadstoturningthefallowland—including,insomecases,rainforestinplacessuchasBrazil—intofarmland,whichinturngivesofflotsofcarbondioxide（CO2）intotheair.Finally,overmanyyears,theenergybenefitfromburningethanolwould

4、makeupfortheforestloss.Butbythen,climatechangewouldhaveprogressedsofarthatitmightnothelp.　　Youcannotreallydeclareanypractice“sustainable”untilyouhavedoneacompletelift-cycleanalysisofitsenvironmental（环境的）costs.Eventhen,technologyandpublicpolicykeepdeveloping,andthat

5、developmentcanleadtounforeseenandundesiredresults.Theadmirablegoaloflivingsustainablerequiresplentyofthoughtonanongoingbasis.　　57.Whatmightdirectlycausethelossoftheforestaccordingtothetext?　　A.Thegrowingdemandforenergytomakeethanol.　　B.Theincreasingcarbondioxideint

6、heair.　　C.Thegreaterneedforfarmland.　　D.Thebigchangeinweather.　　【答案】C　　【解析】推理判断题。注意问的是直接原因。Thatresultleadstoturningthefallowland—including,insomecases,rainforestinplacessuchasBrazil—intofarmland　　58.Theunderlineword“it”inthesecondparagraphrefersto“”.　　A.theenergybe

7、nefitB.theforestloss　　C.climatechangeD.burningethanol　　【答案】A　　【解析】根据上下文可知是指能源优势。　　59.Theauthorthinksthatreplacinggaswithcornethanolis.　　A.impracticalB.acceptableC.admirableD.useless　　【答案】A　　【解析】作者意图判断题。根据全文可知作者认为用corn代替gas是不符合实际的，会带来很多意想不到的问题。　　60.Whatdoestheauthor

8、mainlydiscussinthetext?　　A.Technology.B.Sustainability.　　C.Ethanolenergy.D.Environmentalprotection.　　【答案】B　　【解析】主旨判断题。读完全文我们可以知道，作者主要谈论的是可持续性的判断依