阅读下面短文，掌握其大意，然后从各小题的 A、B、C 三个选项中选出最佳答案。

     David Rockefeller died in his sleep at his New York home on March 20, 2017. According to Forbes, he was 101, the 1 billionaire on 2017 world's richest list.

     The Rockefeller family is an American industrial and banking family. It was one of the world's largest fortunes in the oil business during the early 20th century. They are one of the most 2 families in the history of the United States.

     David Rockefeller, the grandson of America's first billionaire John D. Rockefeller, was born in New York City on June 12, 1915. He  3his studies of Science from Harvard University in 1936, and then furthered his education in the University of Chicago, where he received a Ph.D. in economics in 1940.

     He 4 in North Africa and France in military intelligence during World War II. After returning to the United States, Rockefeller began a great 5 in banking. During the 1970s Rockefeller was chairman and CEO of Chase Manhattan Bank and helped solve New York City's financial problems in the middle of the 1970s.

     By the time he retired in 1981, David Rockefeller was 6 as 'RULER OF THE WORLD' in banking, education, foreign relations and public service. He developed good 7 with world leaders, 8 South African President Nelson Mandela and China's Deng Xiaoping.

     David Rockefeller, along with The Rockefeller family, developed close generational ties with China over the past 100 years. His life witnessed (见证) the century-long connection with China. The Rockefeller foundation (基金会) put money in China's science, medicine, and higher education. They bought the Union Medical School and renamed it the "Peking Union Medical College." The foundation 9 a first-class school of medicine in China. They also introduced the US Johns Hopkins model to the Peking Union Medical College Hospital (北京协和医院) which remains one of the 10 hospitals in China today.