![TheNationalGalleryofArtinWashington,D.C.,isoneoftheworl...]( "TheNationalGalleryofArtinWashington,D.C.,isoneoftheworl...")
- 問題詳情：TheNationalGalleryofArtinWashington,D.C.,isoneoftheworld'sgreatestartmuseums.Millionsofpeoplehaveentereditsdoorstoseepaintingsbytheworld'sfineartists.Butifthesepricelessmasterpiecesaretobepreserved,theGallerymustprotectthemcarefully.TheGall...
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