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[托福听力辅导] 2012《科学美国人》:生物多样性的秘密
Tropical Biodiversity Can Thank Steady TempsThe earth's tropics teem with species. They're far more biologically diverse than the cooler parts of the planet. And scientists have credi2012-04-26 编辑：Daisy
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[托福听力辅导] 2012《科学美国人》:漫步月球
Twelve men have walked on the moon. And now you can, too. Virtually, that is. Because planetary researchers are enlisting everyday citizens in scientific exploration of the surface of the moon.At the2012-05-07 编辑：Daisy
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[托福听力辅导] 2012《科学美国人》:漫步月球
Those of you following the World Cup know that at this stage there can be no more draws. Ties are broken during overtime play, or in a penalty kick shootout in which a goalkeeper's ability to2012-05-03 编辑：Daisy
