下面雅思为大家整理了一篇雅思阅读模拟题,是关于fossil的。这篇雅思阅读模拟题的内容非常完整,后面附有相关的题目和详细的答案解析。建议大家在参考这些雅思阅读题的时候,可以限定时间来做,这样就可以对自己的做题速度有更大的提高了。
Dont wash those fossils!
Standard museum practice can wash away DNA.
1.Washing,brushing and varnishing fossils all standard conservation treatments used by many fossil hunters and museum curators alike vastly reduces the chances of recovering ancient DNA.
2.Instead,excavators should be handling at least some of their bounty with gloves,and freezing samples as they are found,dirt and all,concludes a paper in the Proceedings of the National Academy of Sciences today.
3.Although many palaeontologists know anecdotally that this is the best way to up the odds of extracting good DNA,Eva-Maria Geigl of the Jacques Monod Institute in Paris,France,and her colleagues have now shown just how important conservation practices can be. This information,they say,needs to be hammered home among the people who are actually out in the field digging up bones.
4.Geigl and her colleagues looked at 3,200-year-old fossil bones belonging to a single individual of an extinct cattle species,called an aurochs. The fossils were dug up at a site in France at two different times either in 1947,and stored in a museum collection,or in 2004,and conserved in sterile conditions at -20 oC.
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2016-02-26
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