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	更新时间：2007/7/7 　» Download Audio Transcript of radio broadcast is not available. 相关主题链接: US High Court Takes a More Conservative Turn With Bush Appointees Live Earth Concerts Aim to Raise the Heat on Issue of Climate Change How Subprime Home Loans Become Risky Investments The Nineteen Seventies and Eighties Were A Period of Change in American Society Historic Antioch College Faces an Unsure Future Amelia Earhart, 1897-1937: First Woman to Fly Alone Across the Atlantic New Rules for International Health Emergencies Take Effect Heat May Be Nature's Deadliest Killer Improvements in Food Industry Earn Major Award for American Agricultural Scientist Ooh! Ah! Sis-Boom-Bah! Some Music to Go With the Fireworks on the Fourth of July Researchers Work on Malaria-Resistant Mosquitoes Fred Astaire, 1899-1987: His Acting, Singing and Dancing Changed the American Motion Picture Musical