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。
. 阅读第二节
(2017·哈尔滨模拟)
1 People traveled in search of food and shelter or in order to flee from their enemies. Sometimes they were looking for gold or silver in order to become rich. On other occasions they were searching for rich farmland.
This is not to say that no one ever traveled just for fun. Even in ancient times, some pleasure travel occurred. During a typical season, 700, 000 tourists would crowd into the ancient city of Rome, where animals performed and magicians entertained them. 2
3 International tourist arrivals alone reached as many as 546 million in 1994 and are forecast to rise to 937 million in 2010, according to the World Trade Organization.
4 Probably the most common reason for traveling is related to our physical well-being. Actually, traveling to sports events is one of the fastest growing types of travel. In our fast developing society where stress has become part of people’s life, people can rest and relax by having a change of environment and activities.
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