题型:阅读理解 题类:常考题 难易度:容易
高中英语-牛津译林版-高二上册-模块5 Unit 3 Science versus nature
Have you ever wondered when dogs first became “man's best friend” and the world's favourite pet? If you have then you're not alone. When and where dogs first began living side-side with humans are questions that have stirred hot debate among scientists. There are a few hard facts that all agree on. These include that dogs were once wolves and they were the first animal to be domesticated(驯养) by humans. They came into lives some 15000 years ago, before the dawn of agriculture.
Beyond that, there is little agreement. The earliest bones found that are unquestionable dogs and not wolves date from 14,000 years ago. However, 30,000-year-old skulls have been discovered in France and Belgium that are not pure wolf and some scientists think could be dogs.
With such puzzling evidence, many scientists are now turning to DNA to find out when and where dogs were first domesticated. In one research project, tens of thousands of blood samples have been taken from street dogs around the world. The plan is to compare them with those of wolves. It's even possible to analyse DNA from ancient bones. Tiny pieces of the 30,000-year-old skulls mentioned earlier are currently being studied, and another DNA study has already shown that ancient dogs preserved in the Alaskan ice-fields evolved from Asian wolves, not American ones.
Indeed, the ancient DNA may turn out to be more informative than the DNA of living dogs. Because dogs have accompanied humans around the world for thousands of years, their current distribution may tell us very little of their origins. This is why different groups of scientists believe that dogs variously originated in eastern Asia, Mongolia, Siberia, Europe or Africa.
But why were the animals domesticated in the first place? The most recent theory is that dogs domesticated themselves, initially living in and around our ancient villages to eat any food thrown out. Today, this is a way of life still shared by three -quarters of a billion unowned dogs worldwide.
Since 1993, Chicken Soup for the Soul has been a socially conscious company that combines storytelling with making the world a better place. We tell the stories of all people through our efforts, always with an eye to furthering unity and understanding, and an appreciation for our differences.
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• The Chicken Soup for the Soul book series of over 250 titles has sold more than 110 million copies nationwide. Our books have been translated into 43 languages, have been published in over 100 countries, and have sold more than 500 million copies worldwide.
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• In 2008, Chicken Soup for the Soul became the best-selling trade paperback series of all time.
• In 2013 Kerner Entertainment agreed to produce a film based on Chicken Soup for the Soul.
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