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By David McAlary Washington 25 January 2006 When it comes to lung cancer rates among smokers, scientists say race and ethnicity matter. A new study reports significant differences in the rates among s
发表于:2019-01-07 / 阅读(344) / 评论(0)
2006年VOA标准英语（一月）
2006年VOA标准英语（一月）
The fastest train in the US, known as Acela, reaches speeds of 241 kilometers per hour and only operates between Washington, New York and Boston Europe and Asia have enjoyed high speed passenger trains for years, but the United States has lagged behi
发表于:2019-01-13 / 阅读(206) / 评论(0)
VOA标准英语2010年(二月)
VOA标准英语2010年(二月)
Many countries have experienced record-setting high temperatures this year that many attribute to global warming. While governments have spent billions of dollars to study climate change and ways to counteract it, scientists say there are inexpensive
发表于:2019-02-03 / 阅读(329) / 评论(0)
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