whAt is thE mAin(主要的，总管道)iDEA oF this pAssAgE
A．thE priCEs oF shoEs AnD Boots wErE grEAtly rEDuCED on thE First DAy oF thE sAlE.
B．mAny pEoplE CAmE to thE storE on thE First DAy oF thE sAlE.
C．muCh BusinEss(生意) wAs DonE At thE storE on thE First DAy oF thE sAlE.