Test Analysis: This topic examines the exploration of China's modernization-the slogans of Westernization Movement, Revolution of 1911 and New Culture Movement. "Democracy" and "science" were the slogans of the New Culture Movement (starting from 19 15), while "self-improvement" and "seeking wealth" were the slogans of the Westernization Movement (19, 1960s-1990s). "Nation", "civil rights" and "people's livelihood" are the three people's principles. The key to doing this problem is to distinguish which kind of exploration this slogan or proposition belongs to, and then distinguish the time of each kind of exploration. So choose C.