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2英语答案)
Dogs may have become domesticated(驯l化的)because our
ancestors had more meat than they could eat.During the ice age,
hunter-gatherers may have shared food with wolves,which be-
came their pets.
Genetic evidence suggests that dogs became different from
their wolf ancestors between 27,000 and 40,000 years ago.The
oldest known dog burial is from 14,200 years ago,suggesting
dogs were already thought as pets by then.But it isn't clear
whether domestication happened in Europe or Asia-or in multi-
ple locations-or why it happened.Dogs are the only animals do
mesticated by hunter-gatherers:all the others were domesticated
after farming became widespread.One suggestion is that people
