[单选]  二、阅读理解：阅读下面的短文，根据文章内容从A、B、C三个选项中选出一个最佳选项。Climatechangehascausedariseinsealevels.Thishasincreased   saltinfreshwaterusedoncoastalfarms.Asaresultfarmersareincreasingly   tousefieldsclosetothesea.Scientistscallthisprocess“salinization”whichmeansamixtureofsaltandwater.Salinizationisreducingtheworld’sirrigatedlands   1to2percenteveryyear.ButafarmerintheNetherlandsisnowusingamixtureofseaandfreshwatertogrowhealthyandtastyvegetables.MarcVanstartedwithan   .“Weputinalotofplantsinthefieldsandthenweputin,puttheminfreshwaterandinseawaterandallthevarietiesbetweenit,andthenweseewhichvarietyissurvivingandwhichvarietyis   .”