Who designed (设计) the first helicopter (直升飞机)? Who __1__ of the most famous pictures in the world? Who knew more about the human body than most __2__? There is an answer __3__ all these  questions --- Leonardo de 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 one of the greatest artists of his day. By the time he was twenty years old, he was called a master ( 大师) 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.

　　1. A. took                     B. made         C. painted              D. invented
　　2. A. artists            B. doctors     C. painters            D. people
　　3. A. to                 B. of             C. for            D. from
　　4. A. the scientists  B. the artists   C. the world          D. people
　　5. A. draw            B. paint        C. work                 D. build
　　6. A. was just         B. wasn’t just  C. wasn’t               D. was no longer
　　7. A. less              B. no             C. even                 D. very
　　8. A. before          B. after          C. because            D. when
　　9. A. him               B. us              C. them                 D. you
　　10. A. interesting    B. crying        C. smiling             D. surprising

The bicycle is one of the __41__ yet most useful inventions in the world. The surprising thing is that it was not __42__ earlier, although the great inventor Leonardo Da Vinci  (达芬奇)  had drawn pictures for bicycles and also for flying machines and some __43__ things. Those things were not produced __44__ long after he died.

A person riding a bicycle uses __45__ energy (能源) to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed __46__ , most people don't travel or work by bicycle. It's because   __47__ cars on the roads is larger and larger. It certainly becomes __48__ to ride a bicycle. As a result, more people put their bicycles away and go to work __49__ their cars. Perhaps the best way to make riding safer and more popular is to build roads only for __50__, and to make it difficult and expensive for drivers to drive their cars into the city.

41. A. simple         B. simpler            C. simplest           D. more simple

42. A. invent          B. inventing           C. invention           D. invented

43. A. other           B. another            C. others             D. the other

44. A. until           B. when             C. since              D. after

45. A. much           B. no                C. quite a lot of       D. very little

46. A. world          B. countries          C. land               D. villages

47. A. the number of   B. a number of        C. this kind of        D. many kinds of

48. A. safer            B. more dangerous    C. much dangerous    D. more wonderful

49. A. by             B. use               C. in                 D. riding

50. A. buses           B. cars               C. trains              D. bicycles