多项选择题
There are few portraits in the world as famous as Leonardo da Vinci’s Mona Lisa, but the identity of the model for the legendary painting has been an enduring mystery for countless people. Now some experts believe that the young woman might have been an Italian named Lisa Gherardini, the wife of an affluent silk merchant and government figure. Other researchers suspect it might have been Isabella of Aragon, the Duchess of Milan. Whoever she was, the mystery woman certainly gave the world one of its most mysterious smiles.
Which of the following statements about the portrait is supported by the passage（）
A．The portrait is the subject of ongoing controversy.
B．The portrait was of a single unidentified woman.
C．The portrait’s model was smiling as the picture was painte