C. 通过题目中出现的“30,000-year-old animals skulls”定位到第二自然段“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.”可知狗出现的时间最早可追溯到30,000年前,而不是14,000之前。
A. 通过题目中关键词Alaska 定位文中第三自然段最后一句话“another DNA study has already shown that ancient dogs preserved in the Alaskan ice-fields evolved from Asian wolves”可知是用DNA检测的
A. 由最后一段“The most recent theory is that dogs domesticated themselves, initially living in and around our ancient villages to eat any food thrown out”可知狗的自我驯养是因为被村民扔出的食物所吸引。
D
Many people believe that the only way to make our communities safer is to build more prisons. But there’s a way better protect cities and towns by doing just the opposite.
In many countries throughout the world, prison populations have risen dramatically over the past decade. One of the main reasons for this is the large number of repeat offenders; that is people who break the law again once freed from jail. Statistics show that about one in four prisoners freed every year return to jail within three years.
This is partly because ex-prisoners face huge difficulty finding employment. More than a third of them cannot find any job at all. Data show that having a job greatly reduces the chances that a person will commit a crime again or commit one in the first place. Released prisoners who do manage to find steady employment are 50 percent less likely to return to prison. Rather than harming a community, having a job helps ex-prisoners to change their ways and make a positive and productive contribution to their communities.
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