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16.Of all the problems facing modern astronomers,perhaps the most fascinating is:"Can intelligent(有智能的) life exist elsewhere?"Since the Earth is an unimportant planet moving round an unimportant star,it would be a pride on our part to suppose that we are the only intelligent beings in the universe.But to obtain proof is difficult.
The main trouble is that our neighbor worlds,the bodies in the solar system appear to be unsuitable for advanced life forms.The Moon may be ruled out at once; it has hardly any atmosphere.Venus(金星) is little better; the surface temperature is extremely high and the atmosphere is mostly carbon dioxide.Mars(火星) with a very thin atmosphere and a severe shortage of water,may well support simple plant life but there seems no hope of finding animals,while the attractive Martians of the story-tellers have long since been given up.
Of course this has not stopped the flow of bright ideas for communicating with the supposed people on Mars.In the early nineteenth century the great mathematician Gauss suggested planting tree-patterns in Siberia,so that the Martians would see them and replay suitably.Following up this idea,the Austrian scientist Karl Littrow proposed digging very wide ditches(沟) in the Sahara,triangular in patterns,and then filling them with petrol or some substance so that,when lit,the ditches would present Martian observers with a"flaming triangle"which would show the existence here of intelligent minds.Even better were the plans of Charles Cross,a French writer of the 1870's,who wanted to build a large mirror to reflect the sun's rays and concentrate them on the surface of Mars,thereby making a vast burning-glass.By swinging the mirror around,Cross explained it would be practicable to write words in the Martian deserts simply by burning the sand.For many years he bombarded (鼓吹) the French government with literature about this plan and was very disappointed when no official interest was shown.

48.From the passage we can learn that the opinion of the writer is thatC.
A.people on the earth are almost certainly the only intelligent beings in the universe
B.people on the earth are definitely the only intelligent beings in the universe
C.there may be other intelligent beings in the universe
D.there are other intelligent beings in the universe
49.Why is there unlikely any life on Venus?D
A.Because the weather is too cold.
B.Because it is severely short of water.
C.Because it has a very thin atmosphere.
D.Because the surface temperature is too hot.
50.According to the passage,it seems that MarsC.
A.may have both vegetable and animal life
B.may be inhabited by attractive Martians
C.may have some vegetable life
D.can have no life at all
51.How did Gauss,the mathematician,want to establish contact with the Martians?B
A.By building a large mirror.
B.By making patters with trees.
C.By filling wide ditches with oil.
D.By planting trees in triangular shape.
52.It can be learned from the last paragraph that Charles Cross feltA.
A.disappointed at the lack of official interest shown in his plan
B.surprised that the officials were interested in his suggestion
C.angry when the government paid little attention to his ideas
D.pleased when the government did take notice of his plan.

分析 19世纪早期,伟大的数学家Gauss 建议在西伯利亚种树,以便火星人看见并适当地作出反应

解答 48.C 观点态度根据第一段最后两句,由于地球是一颗围绕一颗不重要的恒星转动的行星,因而我们可以自豪地假定我们是宇宙中唯一的智能生命.但是要证实这种假设很难.可见,我们是宇宙中唯一存在的智能生命这种假定没有确凿的依据.换句话说,宇宙中可能存在其他的智能生命.C项说法正确.A,B、D三项说法均未肯定,故不对.
49.D 语义理解 根据第二段第三句指出了金星不存在生命的原因:表现温度过高,并且大气主要是由二氧化碳组成.D项说法与之相符;A项与此相反,故不对;BC两项不是金星上不存在生命的原因,也不对,可知选D.
50.C 推理判断 根据第二段最后一句中的may well support simple plant life but there seems no hope of finding animals可知,火星上可能有植物生命,但没有动物,然而火星人存在的说法也被放弃了.C项说法正确,A、B、D三项不对.
51.B 细节理解根据题目问及Gauss想通过何种方式与火星人建立联系.第三段第二句指出19世纪早期,伟大的数学家Gauss 建议在西伯利亚种树,以便火星人看见并适当地作出反应.CD两项与此不符.A项为干扰项,文章并没有说以三角模式来种树,故A项不对.B项说法与此一致,因此B项为正确答案.
52.A 推理判断 从第三段最后一句可知Charles Cros的态度是感到很失望,因为政府无人对他的计划感兴趣.因此D项为正确答案.

点评 科教类阅读有一定难度,考生可先阅读题干要求,带着问题读文章,可能会更快更准的找到答案,达到事半功半的效果

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