08年职称英语考试阅读判断试题训练(十五)
文章作者 100test 发表时间 2008:07:01 10:00:38
来源 100Test.Com百考试题网
15．A Dog’s Dilemma 狗的两难境地
Finding a babysitter while you go out to work is, for example, an inconvenience. For the African wild dog, one of the continent’s most endangered carnivores, it’s a matter of life and death. New research shows that once packs fall below a certain size, there are not enough animals to both hunt food and stay at home protecting the young.
The African wild dog has declined drastically over the past century. Habitual loss, persecution and unexplained outbreaks of disease have all been blamed. Only 3,000 to 5,000 animals remain, and the species is expected to go extinct within decades if the trend continues.
Other large carnivores such as the spotted hyena face similar pressures, yet are not declining. Now Franck Courchamp of Cambridge University has found a reason why. The dog’s weakness lies in its social organisation.
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