(President Barack Obama tours the DeSoto Next Generation Solar Energy Center with Lew Hey, left, and Greg Bove, right, in Arcadia, Fla, Oct. 27, 2009. Official White House Photo by Chuck Kennedy) 相关文本

Throughout American history though, they have lost that bet and I believe they will this time as well. 可是纵观美国历史他们一再下错赌注我相信这一次也不例外 But ultimately Class of 2012, that will depend on you Don't wait f

For most of that time of life on Earth, living organisms have been relatively simple -- single cells. 地球的大多数时间，生物体多是以简单的单细胞存在的。 But they had great diversity, and, inside, great complexity. 但是它们是十分多样的，

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This is not a distant threat. It is a present danger. The rate of infection is increasing fastest among women and children. Largely unknown a decade ago, AIDS is the third leading killer of young adul