A chronicle professor, Henry Louis Gates, recently studied are search project looking into 19th century African-American fiction and poetry.
				出自-2013年12月听力原文
				Henry Louis Gates uncover in the process of his research?
				出自-2013年12月听力原文
				When telegraphs and trains brought in the idea that convenience was more important than content, Henry David Thoreau reminded us that'.
				出自-2012年12月阅读原文