2. 外语
  3. A. account B. acquired C. basis D. certainly E. counterpart F. descended G. docile H. enables I. inci

A. account B. acquired C. basis D. certainly E. counterpart F. descended G. docile H. enables I. inci

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问题    A. account    B. acquired    C. basis     D. certainly      E. counterpart
   F. descended   G. docile     H. enables    I. incidentally     J. justify
   K. regarded   L. relative    M. sociable    N. superbly      O. timid
   No species has developed a closer relationship with humanity than the dog, though cat-lovers may disagree. But that relationship’s 【C1】______ —what it is about dogs that allows them to live at ease with people—is still little understood. After all, dogs are 【C2】______ from wolves, which are big, scary carnivores (食肉动物)that would 【C3】______ have competed with early man for prey and might not have been averse (反对的)to the occasional human as a light snack.
   Unless specifically bred for fighting, dogs are more 【C4】______ than wolves, so that is clearly part of the answer. But mere docility cannot 【C5】______ for why people like to have dogs in their homes. Sheep are docile, but few people keep them as pets.
   Brian Hare, of Harvard University, thinks he knows. And, as he told the American Association for the Advancement of Science meeting in Seattle, it does not reflect well on the intelligence of mankind’s closest living 【C6】______, the chimpanzee (黑猩猩). Dr. Hare’s hypothesis is that dogs are  【C7】______ sensitive to social cues from people. That 【C8】______ them to fit in with human society. On one level, this might sound common sense. But humans are such 【C9】______ animals that they frequently fail to realize just how unusual are their own skills at communicating. Dr. Hare therefore decided to test his idea by comparing the abilities of dogs with those of chimpanzees, which are often 【C10】______as second only to people in their level of innate intelligence.
【C3】
选项
答案D
解析 空格所在的由that引导的从句主要句子成分完整，推测空格处填入副词。根据常识可知，狼与早期人类争夺猎物(competed with…for prey)的现象是肯定存在的，certainly“必定”符合语义，故选D。
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