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.tudies have already shown contagious yawning in chimpanzees—stimulated by video­recorded footage of yawns.

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