listEning 6 "BotAnyClAss"
{$mEDiAurl}

ACCorDing to thE proFEssor, whAt is thE grEAtEst ADvAntAgE oF hyDroponiCs
A、thE plAnts ArE lEss likEly to DEvElop soil-BornE DisEAsEs.
B、thE CultivAtion rEquirEs muCh lEss lABor thAn trADitionAl mEthoDs.
C、thE wAtEr CAn BE rECyClED in A hyDroponiC EnvironmEnt.
D、lEss spACE is nEEDED to proDuCE A lArgE numBEr oF plAnts.