12.This information in paragraph 3 indicates:
It is critical to follow proper practices in preserving ancient DNA.
The best way of getting good DNA is to handle fossils with gloves.
Fossil hunters should wear home-made hammers while digging up bones.
Many palaeontologists know how one should do in treating fossils.
13.The study conducted by Geigl and her colleagues suggests:
the fact that ancient DNA can not be recovered from fossil bones excavated in the past.
the correlation between the amount of burying time and that of the recovered DNA.
the pace at which DNA degrades.
the correlation between conservation practices and degradation of DNA.
Suggested answers and explanations
1.washing,brushing,varnishing 见第一段。
2.handling with gloves / freezing samples 见第二段。
3.losing authentic DNA / being contaminated / contamination 见第八段Not only is the authentic DNA getting washed out,but contamination is getting washed in
4.they are porous porous 的意思是多孔的。见第八段... which can allow water and contaminants in the form of contemporary DNA to permeate into the porous bones.
5.human evolution 见第十五段。其中shed light on sth的意思是使某事显得非常清楚,使人了解某事。
【雅思阅读实战训练模拟试题(五)】相关文章:
最新
2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26