随着生活水平的日益提高，人们对餐桌上食品的安全问题逐渐担忧起来．继三聚氰胺奶粉事件之后，瘦肉精、牛肉膏等食品安全问题又一次引起了人们的高度关注．瘦肉精能促进猪的骨骼肌（瘦肉）蛋白质合成和减少脂肪沉积，明显增加瘦肉率．人体对“瘦肉精”十分敏感，食用后会出现头晕、恶心、手脚颤抖等症状．它还能降低人体血红蛋白的携氧能力，特别对心脏病、高血压患者危害更大，长期食用则可能导致慢性中毒．请分析回答：

判断下列说法是否正确。

根据短文理解，从A、B、C、D四个选项中选择最佳一项填空。

    Who was the designer of the first helicopter? Who 1 the most famous picture in the world? Who knew more about the human body than most 2? There is an answer 3 all these questions—Leonardo da Vinci(达·芬奇).

    Leonardo may have been the greatest genius(天才) 4 have ever known. He lived in Italy around the year 1500, but many of his inventions seem modern to us today. For example, one of his notebooks has drawings of a helicopter. Of course, he couldn't 5 a helicopter with the things he had. But scientists say his idea would have worked.

    But Leonardo 6 an inventor. He was also one of the greatest artists of his day. By the time he was twenty years old, he was called a master painter, and as he got older he became 7 more famous. Sometimes he drew a hand ten different ways 8 he was ready to paint.

    Many of Leonardo's wonderful paintings are still with 9 today. You may know one of his most famous works—the 10 woman known as the Mona Lisa.