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图片1 图片2 by Jason Marshall A few articles ago, I asked if you ever found yourself at restaurants fumbling to figure out how much to tip; I guessed that you might occasionally resort to seeking advice from your smart phone; and I told you that
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by Jason Marshall In the last article, we learned that there are several ways to calculate the average value of a sample of data. We focused on one such method, the arithmetic mean, and used it to calculate the average number of potato chips in a bag
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By Anjana Pasricha New Delhi 22 October 2006 Children infected with tuberculosis light candles at a march to mark World Tuberculosis Day in New Delhi, March 24, 2006 The World Health Organization says there has been considerable progress in the figh
2006年VOA标准英语（十月）
By Terry FitzPatrick Cape Town 09 January 2008 The beaches, boutiques and vineyards of Cape Town make it one of South Africa's top destinations for tourists. But many visitors are adding a different type of attraction to their holiday stay. They are
VOA标准英语2008年（一月）
By Claudia Blume Hong Kong 24 January 2006 Senior U.S. health officials say that in addition to preparing medical professionals at home for a possible avian influenza pandemic, they are emphasizing gl
2006年VOA标准英语（一月）
I never considered myself unique, but people are constantly telling me, you are a miracle. To me, I was just an ordinary guy with realistic goals and big dreams. I was a 19-ye ar-old student at the University of Texas and well on my way toward fulfil
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