8. 【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。

　　9. 【解析】选D。细节理解题。根据第二段“Wayne suggests that man’s best friend may have enabled the tough journey from Asia into North America. ‘Dogs may have been the reason people made it across the land bridge, ’said Wayne. ‘They can pull things, carry things, defend you from fierce animals, and they’re useful to eat. ’”这些都说明人们之所以带着狗, 是因为它们能为人们提供服务, 有用处。所以D正确。

　　10. 【解析】选A。推理判断题。文章第一段提到狗和人们一同跨过the Bering Land Bridge, 第二、三、四、五段研究狗的DNA “to conclude that today’s domestic dog originated in Asia”, “Researchers have agreed that today’s dog is the result of the domestication of wolves thousands of years ago”, 所以文章中心是谈论北美的狗的起源。

　　【语篇随练】

　　1. is soft to touch

　　2. Having completed

　　3. a new study suggests that

　　4. provides excellent service to

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