A. The origin of the North American dogs.
B. The DNA study of ancient dogs in America.
C. The reasons why early people entered America.
D. The difference between Asian and American dogs.
【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。
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