【典例2】 Domestic (驯养的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (驯服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today。

　　Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication。

　　……

　　The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world.                

　　The passage is mainly about _______。

　　A. why humans domesticated horses

　　B. how humans and horses needed each other

　　C. why horses came in different shapes and sizes

　　D. how human societies and horses influenced each other

　　【解析】本文以时间为顺序，记叙了人类对马的驯化以及马对人类的生活所产生的重要影响。本题考查主旨大意。前四段说明，人类驯养了野马，使得马的种类繁多，这是人类社会对马的影响；最后一段说明，马作为交通工具加速了人类文化传播的进程。故文章的主题应是D所说的内容。此主题句出现在文章的最后一段。如果文章没有明确的主题句，文章的中心思想往往包含在各个段落中，考生可采取提纲挈领的方法，通过分析细节把文章的要点归纳出来，概括出全文的中心思想。

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