单词:tetralophodont
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This is the VOA Special English Development Report. Seven activists from around the world have received the Goldman Environmental Prize for two thousand nine. Former Vice President Al Gore presented the prizes in San Francisco, California last week.
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By Jeffrey Young Washington 22 May 2007 To most Americans, the governments in their towns and regional areas called counties are the governments they interact with the most. And alongside these local governments are groups of citizens who work on the
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10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur