阅读下面短文，并根据短文后的要求答题（请注意问题后的字数要求）。ScientistsbelievethatconditionsonMarsaround3.8billionyearsagowereverysimilartothoseoftheearlyearthwhenprimitiveorganismswe

Question

阅读下面短文，并根据短文后的要求答题（请注意问题后的字数要求）。
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? (3’) (No more than 6 words)
____________________________________________________________________________
【小题2】What does Professor Paul Davies believe? (3’) (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】According to Professor Paul Davies how did the wreckage come into being? (3’) (No more than 10 words)
____________________________________________________________________________
【小题5】List at least two differences about Mars between the past and now. (3’) (No more than 16 words)
____________________________________________________________________________

Answer 1

【小题1】 It probably arises on Mars(3’)  

【小题2】 Life existed on Mars.(3’)

【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’)

【小题5】 created by the impact of comet(彗星) and small planets(3’)

解析
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.”

【小题5】根据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.

考点：
阅读并回答问题

点评：
阅读表达题是从多个角度和方位考查考生对文章内容的理解以及考生本人对相关问题的看法，问题类型多样。这要求学生具有相当强的阅读能力、理解能力、概括能力和表达能力。在答题之前要认真审题 弄清问题要求 回答应具有针对性 要紧扣题目 既要完整 又要简洁；同时还要注意语言运用的准确性、得体性；对于主旨概括类型的题目，要准确理解文章大意、细节，把握作者的观点、态度、语气等，归纳出文章内容要点、篇章或层次结构 为回答问题做好准备；该试题的回答要求字数比较少，所以语言要精辟、简洁，答案要符合标题的要求，能概括出文章大意或作者写作的意图；封闭性问题可以在文中直接找到答案或依据；但是对于开放性的题目，考生要结合自己的观点进行回答；要注意问题后的字数要求，切忌超出各个题目所要求的字数范围。