thE knowlEDgE onE gAins By trAvEling in A ForEign Country is oFtEn ______ .
A．From sEConD-hAnD inFormAtion
B．gAthErED From othEr sourCEs thAn From its inhABitAnts
C．gAinED From thE ArgumEnts ABout thE Country
D．DiFFErEnt From whAt onE hAD BEForE thE trAvEl