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为了帮助大家进行阅读能力的培养，从今天开始，我将针对《新概念英语》第三册的课文，跟大家分享每篇课文的同步拓展训练。 这些拓展阅读的材料，都将选择国内外主流的英文报刊或杂志等，我将对这些内容进行选编，然后编写相应的阅读题目，供大家进行理解训练。阅读题目将涵盖中高考阅读的基本题型。 第1单元的20篇课文平均每篇的篇幅是250词左右，所以在选择拓展阅读材料时，我也尽量把每篇材料的篇幅控制住在250-300词左右。 接下来就从第1课开始吧： 【课文主题】 第1课的主题是美洲狮（Pumas），所以我选择了一篇同样是有关美洲狮的文章。 【拓展阅读】 一、文章内容 The isolating effects of human development are causing a sharp decline in genetic diversity among mountain lions in Southern California, a new study says. Researcher from the University of California, Davis, collected DNA samples from more than 350 mountain lions throughout California and found that animals separated by little more than a highway have far less genetic material in common than they did just 80 years ago, suggesting that there is far less interbreeding among populations. Pumas in the Santa Ana Mountains - effectively fenced in by Interstate 15 to the east, the Pacific Ocean to the west and Los Angeles to the north - displayed lower genetic diversity than those from nearly any other region in the state. So severe is their isolation that the Santa Ana pumas have more in common genetically with lions 400 miles to the north than their neighbors in the Santa Monica Mountains. Tests revealed that the decline in diversity had taken place “within four to six mountain lion generations,” said Holly Ernest, lead author of the study in PLOS One. “So we know that this is happening on a recent time scale” and is a likely result of human development rather than natural separation from other mountain lions. “Genetically diverse populations are better able to handle whatever nature or humans throw at them, like climate change or disease,” said Dr. Ernest, a geneticist now at the University of Wyoming. “If mountain lions lose that genetic diversity, they lose that resilience.” 二、阅读题目 根据文章内容回答下列问题： 1. What causes a sharp decline in genetic diversity among mountain lions in Southern California? 2. What did the DNA samples collected by the researcher Davis suggest? 3. What do the pumas in the Santa Ana Mountains display compared with those from nearly any other region in the state? 4. How many generations has the decline in diversity taken place among the pumas? 5. What will be the likely result if pumas lose their genetic diversity, according to Dr. Ernest? |
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