点击查看：2016年12月大学英语六级听力MP3在线练习汇总

　　Nigeria Commits to Ending Polio in Africa Once and for All

　　非洲尼日利亚致力于终结小儿麻痹症

　　Nigeria has launched an emergency polio vaccination campaign after two new cases of the disease paralyzed children earlier this month (August 11). The government says it will immunize 56 million children by November. VOA's Carol Pearson explains why it’s so important that Nigeria succeed.

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