极心加速度

Scientists have created a climate model that they say proves human activity is responsible for global warming not only at the North Pole, but at the South Pole as well. The model includes data from Antarctica about which relatively little is known.

发表于:2018-12-08 / 阅读(153) / 评论(0) 分类 VOA标准英语2008年(十月)

By Parke Brewer The women's pole vault provided one of the stirring dramas of the 2004 Olympic track and field competition. Until the mid 1990s, women's pole vault was not taken very seriously, mainly

发表于:2018-12-12 / 阅读(198) / 评论(0) 分类 VOA2004(下)--雅典奥运

Larry Newitt from the Geological Survey of Canada charts the movement of the magnetic North Pole as it wanders the icy reaches of northern Canada. To determine where the magnetic pole / is, we can't rely on one single observation. What I try to do is

发表于:2019-01-22 / 阅读(241) / 评论(0) 分类 自然百科2011年

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发表于:2019-02-09 / 阅读(324) / 评论(0) 分类 加州语文教材California Treasures G5
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