He said: “It’s not a real chimpanzee, but it kind of looks like a chimpanzee, and they’re responding to that．”

　　He and his team, including Devyn Carter who designed the cartoons, showed the animals the yawning sequences．

　　“We also had the cartoons doing other movements with their mouths that the chimps often do,’’ he said． “The chimps showed a lot more yawning during the yawn video when the control videos were playing．”

　　He told BBC News that the only way he and his colleagues could explain the “very strong difference” they saw was that seeing the yawns was making the animals yawn．

　　72． According to the passage, the scientists have found that________．

　　A． yawning is a contagious facial expression among chimps

　　B． chimps will imitate a cartoon chimp who is yawning

　　C． chimps are able to understand cartoons very well

　　D． chimps like watching cartoons very much

　　73． According to the passage we can learn that_______．

　　A． yawning on both cartoon videos and pictures can make chimps yawn

　　B． Devyn Carte led the study about contagious yawning[

　　C． children will also be stimulated to yawn by the videos of chimps

　　D． people can control all the features of animals through cartoon

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