ACCorDing to thE proFEssor, whAt ChArACtEristiC oF EArth's moon shoulD A thEory oF its origin BE ABlE to ExplAin
A．thE moon hAs no wAtEr.
B．thE moon ContAins Almost no iron.
C．thy moon is thE lArgEst moon in thE solAr systEm.
D．tilE moon DoEs not hAvE A motEn Cor