D．The lake traces prove that there exists life on Mars now.

　　B

　　Yawning is so contagious(具有传染性的) that chimpanzees can “catch” it from cartoons, according to research.

　　Scientists from Emory University in Atlanta，US, have discovered that a cartoon of a yawning chimp will stimulate(刺激) real chimps to yawn. They describe in the Royal Society journal，，how this could assist in the future study of empathy(同感，共鸣)．The work could also help explain if and how computer games might cause children to imitate what they see on screen.that，” explained Matthew Campbell，a researcher from Emory University's Yerkes National Primate Research Center and lead author of the study.“We're interested in using cartoons for presenting stimuli to animals, because we can control all the features of what we show them，” he continued.he explained that there was evidence that chimpanzees “process animated(动画的) faces the same way they process photographs of faces”．“It's not a real chimpanzee，but it kind of looks like a chimpanzee, and they're responding to that.”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 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.

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