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    Scientists believe that conditions on Mars around 3.8 billion years ago were very similar to those of the early earth, when primitive organisms were spreading through our oceans. At that time, Mars would have been much warmer and wetter than it is today, with an atmosphere composed mainly of carbon dioxide, just like that of the earth at the time. Under these conditions, it is highly probable that life may have arisen on Mars as well.
    But, even if life did not arise naturally on Mars, it does not mean that it could not have existed there. According to Professor Paul Davies of the University of Adelaide, Australia, life forms could have been transferred between the earth and Mars in wreckage (broke pieces) created by the impact of comet(彗星) and small planets on the surface of the two planets.
    Even today, about 500 tons of material from Mars lands on earth every year. It is mainly in the form of the dust but occasionally a larger chunk(厚片，大块) strikes the earth. In 1911, a piece of Martian rock crashed in Egypt, killing a dog. According to Professor Davies, it is in these chunks of rock, which were much larger and more frequent in the past that life forms could have been transported from planet to planet.
    “But how could these life forms have survived their journey through space?” says Paul Davies, “The difficulty in believing this theory is that a bacterium on its own in space has to struggle itself not only against cold but also against deadly cosmic (宇宙的) radiation. But wrapped in a rock the situation is different. A rock ten meters across would shield life inside it from a lot of radiation and the temperature might only be minus 10 or 20 degrees, the sort of thing we have on earth.”
    小题1: Where do some scientists suppose life probably come from? (2’) (No more than 6 words)
    小题2:What does Professor Paul Davies believe? (2’) (No more than 6 words)
    小题3: Why could life survive when transferred from one planet to another? (3’) (No more than 12 words)
    小题4: List at least two differences about Mars between the past and now. (3’) (No more than 16 words)

    小题1: It probably arises on Mars(2’)
    小题2: Life existed on Mars.(2’)
    小题3:  Because the rock wrapped it inside from cold and radiation/Because a rock would shield life inside it.(3’)
    小题4: It was warmer and wetter, and the rocks landing on earth were larger and more frequent.(3’)

    试题分析：本文说明了科学家认为火星上存在生命。
    小题1:根据Scientists believe that conditions on Mars around 3.8 billion years ago were very similar to those of the early earth, when primitive organisms were spreading through our oceans.
    小题2:根据According to Professor Paul Davies of the University of Adelaide, Australia, life forms could have been transferred between the earth and Mars in wreckage (broke pieces) created by the impact of comet(彗星) and small planets on the surface of the two planets.
    小题3:根据According to Professor Paul Davies of the University of Adelaide, Australia, life forms could have been transferred between the earth and Mars in wreckage (broke pieces) created by the impact of comet(彗星) and small planets on the surface of the two planets.
    小题4:根据But wrapped in a rock the situation is different. A rock ten meters across would shield life inside it from a lot of radiation and the temperature might only be minus 10 or 20 degrees, the sort of thing we have on earth.”
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    科目：高中英语 来源：不详 题型：完形填空

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    科目：高中英语 来源：不详 题型：阅读理解

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    Herta Müller, the Romanian?born German writer, has won the 2009 Nobel Prize for Literature.The award was announced in Stockholm.
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