第33题: [单项选择]Which sentence best expresses the main idea of Paragraph 2 A. The first sentence. B. The second sentence and the third sentence. C. The fourth sentence. D. The last sentence. 参考答案:C 答案解析:解析:从文章第二段看,第四句“The counterculture presented men and women with new role choices”是其中心句。