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(溝) 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.a(chǎn)ngry when the government paid little attention to his ideas
D.pleased when the government did take notice of his plan.

分析 19世紀(jì)早期,偉大的數(shù)學(xué)家Gauss 建議在西伯利亞種樹,以便火星人看見并適當(dāng)?shù)刈鞒龇磻?yīng)

解答 48.C 觀點態(tài)度根據(jù)第一段最后兩句,由于地球是一顆圍繞一顆不重要的恒星轉(zhuǎn)動的行星,因而我們可以自豪地假定我們是宇宙中唯一的智能生命.但是要證實這種假設(shè)很難.可見,我們是宇宙中唯一存在的智能生命這種假定沒有確鑿的依據(jù).換句話說,宇宙中可能存在其他的智能生命.C項說法正確.A,B、D三項說法均未肯定,故不對.
49.D 語義理解 根據(jù)第二段第三句指出了金星不存在生命的原因:表現(xiàn)溫度過高,并且大氣主要是由二氧化碳組成.D項說法與之相符;A項與此相反,故不對;BC兩項不是金星上不存在生命的原因,也不對,可知選D.
50.C 推理判斷 根據(jù)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,但沒有動物,然而火星人存在的說法也被放棄了.C項說法正確,A、B、D三項不對.
51.B 細(xì)節(jié)理解根據(jù)題目問及Gauss想通過何種方式與火星人建立聯(lián)系.第三段第二句指出19世紀(jì)早期,偉大的數(shù)學(xué)家Gauss 建議在西伯利亞種樹,以便火星人看見并適當(dāng)?shù)刈鞒龇磻?yīng).CD兩項與此不符.A項為干擾項,文章并沒有說以三角模式來種樹,故A項不對.B項說法與此一致,因此B項為正確答案.
52.A 推理判斷 從第三段最后一句可知Charles Cros的態(tài)度是感到很失望,因為政府無人對他的計劃感興趣.因此D項為正確答案.

點評 科教類閱讀有一定難度,考生可先閱讀題干要求,帶著問題讀文章,可能會更快更準(zhǔn)的找到答案,達(dá)到事半功半的效果

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