题目内容：

Leonardo da Vinci was born on April 15, 1452 in Italy. He is best known as an artist today. One of his famous paintings is called Mona Lisa. However, Leonardo had many other natural abilities. He was also a great inventor. Many of his inventions have become important in modern day life. Although Leonardo hated war, he invented many different machines used for wars. His most special invention was the machine gun, which was produced and used in war many years later.

By watching the way birds fly, Leonardo tried to find out the secret of flying. Among his sketches(素描) we can see several objects. We consider them as modern flying machines. Leonardo spent many hours thinking about how to make good use of time. He developed ideas for labor-saving machines like cutting machines.

Leonardo was a strange man. He didn't eat any meat, which was unusual in those times. He never published his ideas and scientific discoveries. He usually used mirror writing, which looks like writing in a mirror, starting from the right side of the page and moving to the left.

We have very little of his work today. Leonardo finished only a few of his paintings. He left many unfinished because he thought they were not perfect. No one in his life time knew how great Leonardo was. We now believe, however, that he was one of the cleverest men the world has ever known.

1.According to the passage, Leonardo was not only an artist but also       .

A. a musician B. an inventor

C. a writer D. an engineer

2.What was Leonardo's most special invention.

A. The mirror writing B. The cutting machine

C. The machine gun D. The flying machine

3.Which of the following statements is true about Leonardo?

A. He usually wrote in a mirror. B. He didn't eat any meat.

C. He liked to publish his discoveries. D. He enjoyed drawing flying machines.

4.What is the purpose of the passage?

A. To let us know more about Leonardo. B. To introduce Leonardo's great inventions

C. To discuss Leonardo's famous paintings. D. To introduce a great artist to us.