16．The size of the lake found on Mars is ________．

　　A．80 square miles

　　B．1，500 square milesthe weather on Mars was ________．

　　A．hot and wet

　　B．wet and warm

　　C．cold and dry

　　D．cold and wet

　　18．Why do scientists think deltas near the lake may hold secrets about past life on Mars?

　　A．Because similar places on Earth have become natural deposits of markers of life.

　　B．Because someone has put secrets about past life on Mars there.

　　C．Because past life has been found in other deltas on Mars.

　　D．Because some people are said to have already seen life marks there.

　　19．Which of the following statements is NOT true according to the passage?

　　A．The Noachan epoch was a wet and warm era.

　　B．The lake might have existed 3.4 billion years.

　　C．The discovery can't fully prove that the Mars once hosted life.

　　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.

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