it CAn BE inFErrED From thE pAssAgE thAt ______.
A．thE Apollo mission wAs vEry suCCEssFul
B．protECtion From spACE rADiAtion is not A EAsy joB
C．AstronAuts will hAvE DEFormED ChilDrEn or grAnDChilDrEn
D．rADiAtion is not A thrEAt to wEll-protECtED spACE ExplorErs