“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 than when the control videos were playing.” colleagues could explain the “very strong difference” they saw was that seeing the yawns was making the animals yawn.

　　20．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

　　21．According to the passage we can learn that ________．

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

　　B．Devyn Carter 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 cartoons

　　22．By studying the action of chimps, the scientists hope to ________．

　　A．teach them more body language of human beings

　　B．learn how chimps use their brains to study

　　C．control the actions and behaviors of animals

　　D．create more charming cartoon characters

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