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    Who designed the first helicopter (直升机)? Who painted some of the most famous pictures in the world? Who knew more about the human body than most (1)______ of his time? (2)____________

   (3)____________ 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 build a helicopter with the things he had. But scientists say that his idea would have worked.

   (4)___________ He was one of the greatest artists of his day. By the time he was twenty years old, he had been called a master (大师) painter, and as he got older he became even more famous. Sometimes he drew a hand ten different ways before he was ready to paint.

   (5)___________ You may know one of his famous works, the (6)______ (smile) woman (7)______ (know) as the Mona Lisa.