[单项选择]American culture has not been immune to cultural influences from outside. The idea of democracy came from the ancient Greeks: the Industrial Revolution started in England: jazz and rock music preserve African rhythms--to pick a few examples. Indeed, many of the things we think of as "100 percent American" came from other cultures.
Still, most of the changes in American culture over the last century have come from within, as the result of inventions and discoveries. And change has been dramatic. One hundred years ago the United States was largely a nation of farmers. Many of the things we take for granted today- a high school education, for example, or indoor plumbing—were luxuries then. The moon was a light for lovers, not a site for scientific exploration; genetic engineering (基因工程) was not even a subject for science fiction, much less for laboratory research and corporate investments. The decades following the Second World War, in particular, were characterized by spectacular sc
A. The influence of African culture.
B. The American culture changes in 1970s.
C. The influence of American culture.
D. The development of science and technology.

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