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2016年5月18日SAT考试阅读题

2019-08-22

2016年5月18日SAT考试阅读题

  SAT考试阅读题目:CriticalReadingSelectanAnswer  Plants,andallotherlivingthings,requirenitrogenforgrowth;,thisgaseousformisinaccessiblet,buttodothistheymustfirsttakeupresidenceinsidetherootsoflegumeslikepea,alfalfa,clover,andsoybean.  Soonafteralegumebeginstogrow,rhizobiainvadeitsroothairsandmultiply,causingtheplantto:legumescanthrivewithoutnitrogenfertilizersonlyiftheyhavefunctionalnitrogen-fixingnodules,whilethebac,,asnitrogenisthemostcommonnutrientdeficientintheearthssoiland,thus,theonemostcommonlysuppliedbychemicalfertilizers.  Rhizobiaareadiversegrouptaxonomically,genetically,,itisnotthoughtthatthishorizontalgenetransferissufficienttoconfersymbiosis,noftheacquwn.  Whatcanreasonablybeinferredaboutthefixednitrogenreleasedwhenaplantdies  (A)Itisbiologicallyinsignificantbecauseitrevertstoitsgaseousform.  (B)Itisnotsufficienttomaintainadequatenitrogenlevelsinsoil.  (C)Itislessusefulforotherplantsthanthenitrogenfoundinchemicalfertilizers.  (D)Itisnotaconsiderationinfarmersdecisionsregardingagriculturalpractices.  答案:B  解析:  genisoftensuppliedbyfertilizers,eventhoughthefixednitrogenreleasedwhenoughtosupplyallofthenitrogenthatisneededinsoil;fertilizersareneededtoaddresstheremainingnitrogendeficiency。