雅思阅读模拟试题及答案

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　　Education Philosophy

　　AIn 1660s, while there are few accurate statistics for child mortality in the preinduslrial world, there is evidence that as many as 30 percent of all children died before they were 14 days old. Few families survived intact. All parents expected to bury some of their children and they found it difficult to invest emotionally in such a tenuous existence as a newborn child. When the loss of a child was commonplace, parents protected themselves from the emotional consequences of the death by refusing to make an emotional commitment to the infant. How else can we explain mothers who call the infant or leave dying babies in gutters, or mention the death of a child in the same paragraph with a reference to pickles?

　　BOne of the most important social changes to take place in the Western world in 18th century was the result of the movement from an agrarian economy to an industrial one. Increasingly, families left the farms and their small-town life and moved to cities where life was very different for them. Social supports that had previously existed in the smaller community disappeared, and problems of poverty, crime, sub-standard housing and disease increased. For the poorest children, childhood could be painfully short, as additional income was needed to help support the family and young children were forced into early employment. Children as young as 7 might b...

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　　Don‘t 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.

　　5.The team’s attempts to extract DNA from the 1947 bones all failed. The newly excavated fossils，however，all yielded DNA.