题目内容：

    Leonardo da Vinci's(达芬奇) mother may have been a Chinese slave(奴隶) according to a new research by an Italian -Angelo Paratico. He has spent the last 20 years living and working in Hong Kong, researching the links(联系) b1. his homeland and China.

It is believed that Leonardo da Vinci's mother was named Caterina, who, according to some reports, was a local farmer. But Mr. Paratico's new work leads to a d2. explanation.

Speaking to the South China Morning Post, Mr. Paratico said, “I am s3. that Leonardo's mother was from the East, but to make her a Chinese, we need to use a deductive method (演绎法).”

Angerlo Paratico has s4. many documents(文献). He found that one wealthy friend of Leonardo's father’s had a slave called Caterina. After Leonardo's date of b5., she disappeared from the documents. “She was no longer working there and could not be found,” Paratico a6.. Supporting his opinion, he said, “During the period, countries like Italy and Spain were f7. of slaves from the East.”

He said that there were certain aspects(方面) of Da Vinci's life and works which suggest a Chinese link. An e8. is that he was writing with his left hand from left to right. And he was a vegetarian(素食者), which was not common. Mona Lisa(蒙娜丽莎) is probably a picture of his mother. On the back of Mona Lisa, there is a Chinese landscape and e9. her face looks Chinese.

Mr. Paratico said the only way to s10. the mystery is to extract(提取) some DNA. But he said he preferred to let the mystery remain mysterious.