15．The passage starts with an elephant story in order to explain that ________.

　　A．people easily fall victim to elephants' attacks

　　B．the man­elephant relationship is getting worse

　　C．elephant tamers are in short supply

　　D．dogs are as powerful as elephants

　　解析：选B　推理判断题。根据文章整体内容可推知，文章以一头大象的故事开头是为了展现人类和大象日益紧张的关系，故选B项。

　　Ⅱ.阅读七选五

　　(2016·山西四校联考二)You think you know your dog. __1__ She probably recognizes you when she sees you. But can a dog tell by simply looking at you whether you have a happy or an angry expression on your face? Researchers in Austria have taught pet dogs to know the difference.

　　__2__ When dog owners shout or speak in a strong, sharp voice, dogs often act guiltily and quietly move away from the area.

　　Recently, researchers found that dogs can look at our faces, and tell the difference between a smile and a frown. The animals were able to recognize a look of approval from one of disapproval.Researchers at the University of Veterinary Medicine Vienna performed a series of experiments. __3__ They showed the dogs two pictures of either the upper or lower half of a person's face. On one picture, the person looked happy. The other appeared angry. The dogs were then shown images of the eyes or mouths of people they had never seen before.__4__

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