thE sEntEnCE "musEum is A slippEry worD" in thE First pArAgrAph mEAns thAt ______.
A．thE mEAning oF thE worD DiDn't ChAngE until AFtEr thE 15th CEntury.
B．thE mEAning oF thE worD hAD ChAngED ovEr thE yEArs.
C．thE grEEks hElD DiFFErEnt ConCEpts From thE romAns.
D．prinCEs AnD mErChAnts ADDED pAintings to thEir CollECtions.