6. 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

　　【解析】选D。细节理解题。根据“They found the dogs all lived between the years of 1450 and 1675 A. D. , before Vitus Bering and Aleksey Chirikov who were the first known Europeans to view Alaska in 1741. . . ”可判断出被研究的骨头不是欧洲人带到北美的狗的骨头。所以D正确。

　　7. 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.

　　D. Ancient dogs entered North America across the Bering Land Bridge.

　　【解析】选D。细节理解题。根据第一段“When people first walked across the Bering Land Bridge thousands of years ago, dogs were by their sides, according to a study published in the journal Science. ”可知D正确。

　　8. What does the passage mainly talk about?

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