listEning 5"AstronomyClAss"
{$mEDiAurl}
how DoEs thE proFEssor ExplAin thE tErm solAr systEm
A、hE iDEntiFiEs thE kEy FEAturEs oF A solAr systEm.
B、hE rEFErs to thE glossAry in thE tExtBook.
C、hE givEs sEvErAl ExAmplEs oF solAr systEms.
D、hE ContrAsts A solAr systEm with A gAlAxy.