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why DoEs thE proFEssor mEntion Driving A CAr whilE throwing A roCkA．to DisCuss thE EFFECts oFEinstEin’s thEoriEs on physiCs.
B．to ExplAin thE DiFFErEnCEs BEtwEEn two FrAmEs oF rEFErEnCE.
C．to show thAt lAws oF motion AFFECt EvEryDAy liFE.
D．to ArguE thAt FrAmEs oF rEFErEnCE Exist.