2025年高中英语YL版高考课时作业(二十二)　选择性必修第三册Unit 2　Out of this world.docxVIP

答案站内有哪些信誉好的足球投注网站2025年高中英语YL版高考课时作业详解答案

答案站内有哪些信誉好的足球投注网站2025年高中英语YL版高考课时作业详解答案

课时作业(二十二)选择性必修第三册

Unit2Outofthisworld

Ⅰ.阅读理解

A

[2024·江苏省镇江市高三检测]Peopleoftenrecommendplantingtreestomakecitiesgreener,cleanerandhealthier.Butduringheatwaves,citytreescanactuallyincreaseairpollution.Indeed,anewstudyhasfound,upto60percentofthesmoggyozoneinacitysaironhotdaysmaytracetochemicalsemittedbytrees.GalinaChurkina,whoworksatHumboldtUniversityofBerlin,andherteamhaveconfirmedit.

Thefindingsmightseemtheoppositeofwhatyouwouldexpect,notesRobertYoung,anexpertincityplantingattheUniversityofTexasatAustin.Indeed,hesays,“Everythinghasmultipleeffects.”Thenewfindingsdonotmeancitiesshoulddiscouragetreeplanting.Instead,citiesmayneedstrictercontrolsonothersourcesofpollution,suchastailpipeemissionsfromcarsandtrucks.

Citytreessoakupcarbondioxide,andatthesametimetheyreleaseoxygenintotheair.Butoxygenisfarfromtheonlygasthattreesandcertainothergreenplantsreleaseintotheair.Oneofthesechemicalsisahydrocarbonknownasisoprene(异戊二烯).Itcanreactwithcombustion(燃烧)pollutants,suchasnitrogenoxides(氮氧化物)emittedbycarsandtrucksincities.Theresultistheformationofozone,acomponentofsmog,whichcanirritatethelungsandcauseairwaydiseases.

Churkinasaysherteamisnotsurprisedtoseetheseeminglycontraryrelationshipbetweenplantsandpollution.Sheaddsthatitsimportanceisquiteamazing.“Theresults，”Churkinasays,“suggestthatcitytreeplantingprogramsshouldnotignoretherolethisgreenerymayplayinaggravatingsummerairpollution.”“Addingmoretreeswillimprovequalityoflifeonlyifthosecitiesalsoundertakeplanstosharplycutvehiclepollutioninsummerandtoincreasetheirrelianceoncleanenergysourcesforelectricpower.”shesays.

1．Whatdoesthenewstudyfind