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短文:统计学简介
统计学Statistics There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of govern...
背诵美文——化石
A Rare Fossil RecordThe preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroye
二氧化碳能增加食欲
短文Carbon dioxide is a potent greenhouse gas. Levels of carbon dioxide, or CO2, in the atmosphere are increasing at an unprecedented rate. But what impact do higher CO2 levels have on plants?...
电视
电视Television -- the most pervasive and persuasive of modern technologies, marked by rapid change and growth -- is moving into a new era, an era of extraordinary sophistication and versatil...