66. But at last the determination and patience of the scientists was rewarded in 1996 with a b______________ (突破)--- the cloning of Dolly the sheep.

65. Firstly, gardeners use it all the time to produce c______________ (商业的;贸易的) quantities of plants.

64. It is a way of making an e____________ (精确的; 准确的) copy of another animal and plant.

63. Now it’s a tourist area with lots of shops, seafood restaurants and b____________ (面包房).

62. It is believed that before long the mix of nationalities will be so great that there will be no major r____________ (人种的; 种族的) or cultural groups.

61. Today, Chinese-Americans live in all parts of California, although a large p____________ (百分比; 百分率) have chosen to stay in the “Chinatowns” of Los Angeles and San Francisco.

Who designed the first helicopter ? Who 　31　 　some of the most famous pictures in the world? Who knew more about the human body than most　 　32　 of his time? There is an answer　 　33　　 all these questions __ Leonardo da Vinci.

Leonardo da Vinci may have been the greatest genius 　34　 　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 　35　 　a helicopter with the things he had. But scientists say his idea would have worked.　

But Leonardo 　36　 　an inventor. He was one of the greatest artists of his day. But the time he was twenty years old, he was called a master painter, and he got older he became 　37　 　more famous. Sometimes he drew a hand in different ways 　　38　 　he was ready to paint.

　　 Many of Leonardo’s wonderful paintings are still with 　39　 　today. You may know one of his most famous works the 　40　 　woman known as the Mona Lisa.

31. A. took　　　　　 B. made　　　　　 C. painted　　　　　　 D. invented

32. A. artists　　　　 B. doctors　　　　 C. painter　　　　　　 D. people

33. A. to　　　　　　 B. of　　　　　　 C. for　　　　　　　　 D. from

34. A. the scientists　　 B. the artists　　　 C. the world　　　　 D. people

35. A. draw　　　　　 B. paint　　　　　 C. work　　　　　　 D. build

36. A was just　　　 B. wasn’t just　　　 C. wasn’t　　　 D. was no longer

37. A. less　　　　 B. no　　　　 　　　C. even　　　　　 D. very

38. A. before　　　 B. after　　　　　 　C. because　　　　 D. when

39. A. him　　　　 B. us　　　　　　 C. them　　　　　 　D. you

40. A. interesting　 B. crying　　　　　 C. smiling　　　 　D. surprising

30. The people in flooded areas owed________ the PLA soldiers for their rescue work.

　 A. a great deal for　 B. great deal for　 C. a great deal to　 D. great deal to