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13.But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half every 20 years, a pattern known as the secular trend in height. 【分析】复合句。as引导时间状语从句,主句主
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This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? You might think that the World Toilet Summit was a meeting of Wall Street bigwigs. But no, its actually about toilets. The three day conference opened on November 4th
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