soCiAl sCiEntists hAvE rECEntly BEComE grEAtly intErEstED in spACE BECAusE ______.
A．spACE inDustriAlizAtion will CrEAtE nEw mArkEts AnD morE joBs on EArth
B．spACE ExplorAtion will BE hArmFul to mAn
C．spACE ColonizAtion is nEAr At hAnD
D．othErwisE tEChnologists will CAtCh thE opportunity to go to spACE