题目内容：
根据材料，回答问题。Who designed the first helicopter?Who ___21___the most famous pictures in the world?Who knew more about the human body than most___22___? There is an answer___23___ all these ques- tions-Leonardo de Vinci．
Leonardo may have been the greatest genius___24___ 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 note- books has drawings of a helicopter．Of course，he couldn’t___25___a helicopter with the things he had．But scientists say his idea would have worked．
But Leonardo___26___an inventor．He was 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___27___more famous．Sometimes he drew a hand ten different ways___28___ he was ready to paint．
Many of Leonardo’s wonderful paintings are still with___29___ today．You may know one of his most famous works the___30___woman known as the Mona Lisa．
21． A．took
B．made
C．painted
D．invented
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