Bài tập cloze test - Đề 8

  CLOZE TEST 8

Though the evolution and domestication of the dog have long been studied, the story is 1 no means fully understood 2 There are currently more than thirty species of Canidae, the dog-like animals 3 include wolves and coyotes, jackals and foxes, but the Grey Wolf, Canis Lupus, is the domestic dog's sole wild ancestor and cousin, and it 4 exists. Some modern breeds of dog retain 5 wolf-like characteristics of behaviour and appearance to this day, and the two species remain genetically close 6 to be able to interbreed easily. 7 the use of DNA evidence may lead eventually 8 greater clarity, the precise classification of fossil remains from remote periods of prehistory can be uncertain when dealing with such very closely related species. There would undoubtedly have been many contacts, hostile, neutral and occasionally friendly between individual wolves or proto-dogs and human communities.