been present from the beginning, giving some wolves a leg up( )-or maybe even becoming our best friends. 28. What does the new study find? Wolves are like dogs in many ways. A. Woll pups also show the fetching skill. D. Dogs are actually turned from wolves C. Walves can't be friends with humans. 29. Why did researchers choose several groups of wolf and dog pups? A. To prove that the finding of the study is true. To find the effect of domestication on them. C. To find out when they began the fetching skil D. To train them to offer help to people in need. 30. What does the underlined word "retrieve" in the second paragraph mean? A. Refuse. D. Fetch 31. When did Sting get the ability to socialize with humans? Ignote. C. Throw. A. After it was trained. C. When is was given birth to. B. After it left its home D. When the familiar assessor came.