Leonard and Wayne’s study suggests that dogs joined the first humans that made the adventure across the Bering Land Bridge to slowly populate the Americas. Wayne thinks the dogs that made the trip must have provided some excellent service to their human companions or they would not have been brought along. “Dogs must have been useful because they were expensive to keep, ”Wayne said. “They didn’t feed on mice; they fed on meat, which was a very guarded resource. ”

　　6. The underlined word “remains” is closest in meaning to“　”.

　　A. leftover food

　　B. animal waste

　　C. dead bodies

　　D. living environment

　　7. According to the study described in Paragraph 4, we can learn that　.

　　A. ancient dogs entered North America between 1450 and 1675 A. D.

　　B. the 11 bones of ancient dogs are not from native American dogs

　　C. the bones discovered by the gold miners were from North American wolves

　　D. the bones studied were not from dogs brought into North America by Europeans

　　8. What can we know from the passage?

　　A. Native Americans domesticated local wolves into dogs.

　　B. Scientists discovered some ancient dog remains in the 1920s.

　　C. Latin America’s dogs are different from North America’s in genes.

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