题目内容：
阅读材料，回答题。Susan Sontag (1933——2004) was one of the most noticeable figures in the world of lit-erature． For more than 40 years she made it morally necessary to know everything——to read every book worth reading, to see every movie worth seeing． When she was still in her early 30s, publishing essays in such important magazines as Partisan Review, she appeared as the symbol of American cultural life, trying hard to follow every new development in liter- ature, film and art． With great effort and serious judgment, Sontag walked at the latest edges of world culture．
Seriousness was one of Sontag's lifelong watchwords (格言), but at a time when the barriers between the well-educated and the poorly-educated were obvious, she argued for a true openness to the pleasures of pop culture． In "Notes on Camp", the 1964 essay that first made her name, she explained what was then a little-known set of difficult under-standings, through which she could not have been more famous．"Notes on Camp", she wrote, represents "a victory of 'form’over 'content’, ‘beauty’over ‘morals’”．
By conviction (信念) she was a sensualist (感觉论者), but by nature she was a mor- alist (伦理学者), and in the works she published in the 1970s and 1980s, it was the latterside of her that came forward． In Illness as Metaphor——published in 1978, after she suf-fered cance—she argued against the idea that cancer was somehow a special problem of re-pressed personalities (被压抑的个性), a concept that effectively blamed the victims for the disease． In fact, re-examining old positions was her lifelong habit．
In America, her story of a 19th century Polish actress who set up a perfect society in California, won the National Book Award in 2000． But it was with a tireless, all-purpose cultural view that she made her lasting fame．"Sometimes," she once said,"I feel that,in the end, all I am really defending ．．． is the idea of seriousness, of true seriousness． "
And in the end, she made us take it seriously too．
The underlined sentence in Paragraph 1 means Sontag __________． A．was a symbol of American cultural life
B．developed world literature, film and art
C．published many essays about world culture
D．kept pace with the newest development of world culture
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